De Groot is a pirate on The Walrus in the West Indies.
During the events of Black Sails: Season 1 Episode 4 IV. played by Andre Jacobs
Billy Bones and Gates walk out onto the deck of The Walrus and Gates tells the crew that Billy will be their new quartermaster. Billy tells the crew that they will need to careen the ship. He asks the crew where they should do it and Muldoon suggests somewhere where there is plenty of rum. Froom asks if they will have a tent for fornication and Billy mentions that it is something they can discuss later. Billy asks De Groot his opinion and De Groot says The Walrus is unsuitable for the task of careening the ship and asks to find a more suitable beach. Captain Flint says they cannot delay the careening or they will lose their chance at catching the Urca. Billy calls for a vote and all but Morley agree to it.
Flint rides to the beach and De Groot tells him that they are ahead of schedule of cleaning the ship. The wind starts to pick up and De Groot notices the palm Froom and Crisp tied to the rope to start to strain, but doesn't tell Flint. The wind starts to make the palms pull away from the sand. As everyone is running away from the ship, Randall sees Betsy hiding under the ship. Randall goes after her and the ship leans slightly and starts to crush Randall. Morley and Flint run to help Randall and Betsy runs away. They start to dig the sand under Randall while De Groot tells Billy that they have to cut the remaining rope to save the ship's mast. John Silver runs over and throws his butcher knife to Flint who starts to hack at Randall's stuck leg. The ropes are cut and the ship lurches, Flint manages to pull Randall away, but Morley is crushed under the ship.
During the events of Black Sails: Season 1 Episode 5 V. played by Andre Jacobs
Flint gets upset that The Walrus isn't catching up to the Andromache and orders all the sails be raised. De Groot warns against raising all the sails and Logan and Dufresne measure their speed. Billy agrees with De Groot, but then changes his mind when Flint stares at him. Gates then gives the order to increase the sails and they increase their speed.
During the events of Black Sails: Season 1 Episode 6 VI. played by Andre Jacobs
After pirates of The Walrus manage to overtake the Andromache, De Groot advises Billy on where to place the cannons.
During the events of Black Sails: Season 1 Episode 7 VII. played by Andre Jacobs
De Groot and Dr. Howell hold back Randall from attacking Silver. De Groot tells Silver that the ship's council voted Randall off the crew. Randall Tells De Groot and Howell that Silver stole the page and not Singleton. De Groot tells Dufresne what Randall told him. Howell suggests they keep the information from the crew so that they can continue with their hunt of the Urca. Dufresne, De Groot and Howell go to get Silver after he fails his test and Silver pulls a knife on De Groot, who pulls his own knife out. Randall then starts calling everyone a thief.
During the events of Black Sails: Season 1 Episode 8 VIII. played by Andre Jacobs
The Walrus and Ranger arrive at Division Bay and Flint briefs his crew. Once they get view of the bay. no ship is there. Logan spots sails and yells it to the crew and yells out that the ship is a Man-o'-War. Flint comes up with a plan to make it appear like the Ranger is attacking The Walrus and then ambush the Man-o'-War as it gets closer.
Silver yells at the Man-o'-War that they are being followed by a pirate ship and points at the Ranger. He tells the Spanish Officer where they came from and the Man-o'-War continues on its way. As Flint is about to give the order to fire on the Man-o'-War, Dufresne pulls a pistol on him and accuses him of tyranny against the crew. De Groot pulls a pistol on Silver. Silver and De Groot struggle for De Groot's pistol. As De Groot is about to shoot Silver, Randall hits him with his fake leg.
During the events of Black Sails: Season 2 Episode 1 IX. played by Andre Jacobs
Flint starts to tell The Walrus crew his plan. Logan angrily yells that they should be cutting Flint's lying tongue from his head and Dufresne tells the crew to listen to Flint. Flint suggests they steal the warship and then take the gold. He continues to tell his plan of sending two people to kill any sentries on the ship while the rest of the crew readies an assault. De Groot gets upset with listening to Flint's plan and Flint volunteers to be one of the men to kill the sentries and Silver volunteers to be the other. Later, Ranking Spanish Sailor looks towards the water and Joji shoots him in the head. Joshua breaks the door down where Flint and Silver are hiding and he and the rest of The Walrus crew kill the remaining Spanish crew. They then manage to steal the Spanish ship and escape.
During the events of Black Sails: Season 2 Episode 2 X. played by Andre Jacobs
Dufresne tells De Groot, Flint suggested not to hug the coast as that will take them through the Kingston route and the other pirates will want to take any ship they encounter and De Groot tells him that perhaps Flint is worried that if Dufresne successfully captured a ship, then Flint's chances of retaking the captaincy would diminish. A ship is spotted and Logan tells Dufresne that it is flying English colors. Dufresne then decides to attack it. Dufresne manages to take the English ship without a fight. Dufresne and part of The Walrus crew board the English ship and the Merchant Captain whistles and a fight breaks out. Joji kills the Merchant Captain, but the pirates and Dufresne are forced to retreat back to The Walrus. De Groot tells Dufresne that they must retreat and Dufresne freezes once again. Flint tells Dufresne that they have to sink the English ship or no one will ever surrender to Flint's flag again and then Flint starts giving out orders. The English ship is then sunk.
During the events of Black Sails: Season 2 Episode 3 XI. played by Andre Jacobs
Flint tells the crew that he will tell Captain Charles Vane that he and his men must leave by sunrise tomorrow or they will attack the fort.
During the events of Black Sails: Season 2 Episode 4 XII. played by Andre Jacobs
Captain Benjamin Hornigold tells his attack plan to Flint, Mr. Scott, De Groot, and Dufresne. Flint asks how long it will take to rebuild the fort and Hornigold asks him if he intends to follow through on his threat to take the fort. Later, Flint walks to his and Hornigold's crew and tells them to fire on the fort.
During the events of Black Sails: Season 2 Episode 5 XIII. played by Andre Jacobs
Flint tells his crew to cease fire and De Groot repeats the order. Flint then orders his crew to prepare to move ashore.
During the events of Black Sails: Season 2 Episode 6 XIV. played by Andre Jacobs
Billy walks into camp and is greeted by the rest of Flint's crew and Dufresne hugs him. Billy tells the pirates of The Walrus about his ordeal and that the British Navy is encamped 40 miles away. Dufresne then asks Billy how he fell overboard.
During the events of Black Sails: Season 2 Episode 7 XV. played by Andre Jacobs
Before the vote for captaincy, Hornigold makes his speech and calls Flint a liar, murderer, thief and betrayer. Silver walks up to Flint and tells him that they need to talk and then tells Flint that the Urca gold is gone. The pirates overhear Silver and start talking to each other about the stolen gold.
After the vote is cancelled and the pirates try to figure out what to do next, Silver gives his speech and admits to the pirates that he planned on leaving them when they got the gold. He tells them that he thinks many of them also had that idea, but now with the gold gone, their only other option is getting reconciliation.
Billy meets with Dufresne and the other traitors to Flint including Big Conspirator. The rest of The Walrus crew also show up and Billy reveals the conspirators to be the traitors to their fellow pirates that they are. Big Conspirator questions Billy's manhood and Billy beats him up and tells everyone that they will stick together and follow Flint's plan until they are all safe.
During the events of Black Sails: Season 2 Episode 8 XVI. played by Andre Jacobs
Silver tells the crew a story of when he was on a merchant vessel and when he first saw Charles Town. He continues about how he and the rest of the crew saw the execution of Solomon Little. Silver ends his story by telling the pirates that the entire population of Charles Town is eager to see them dead. De Groot sends Tyson, Howard and Nicholas to unfurl the sails. Nicholas then falls to his death.
During the events of Black Sails: Season 2 Episode 9 XVII. played by Andre Jacobs
Billy sees Vane's men climb onto the deck and warns his fellow pirates. A battle erupts and during it, Vane kills Joshua and then fights Billy. The battle ends and Jenks tells Vane that the Man-'o' War is secure. The Boat Captain tells Vane and his men that Peter Ashe has a message for them, Flint has violated Peter's trust and he will be placed under arrest. Flint will be put on trial and hung and if the pirate ship remains, it will be sunk. Vane brings Vincent and Silver on deck. Vane tells his crew that Nassau is strongest when it is feared and suggests they free Flint.
During the events of Black Sails: Season 2 Episode 10 XVIII. played by Andre Jacobs
Yardley has Baymen Lieutenant grab Silver and Flint's crew stand up to block them from leaving with Silver. Billy headbutts Yardley and a fight breaks out, but Silver is dragged away. As Jenks is about to slit Silver's throat, Flint's crew storm into the room and Billy kills Jenks while Yardley and Baymen Lieutenant are also killed. De Groot tells the crew to raise the sails and Mr. Scott tells them to get ready to sail. Billy has the crew fire upon the blockade ships. Flint and Vane get into a boat and start to row towards the Man-o'War and are fired upon by William Rhett and some militia men. The Man-o'-War opens fire on Rhett and kills him. Flint has Vane's men released and has the ship continue to fire upon Charles Town.
During the events of Black Sails: Season 3 Episode 1 XIX. played by Andre Jacobs
Hallendale's ship is spotted floating in the water. De Groot tells Silver and Billy that maybe the ship was abandoned. Dooley thinks they should check the ship out in case the crew needs help and Silver agrees, but Flint thinks it is a bad idea. Flint goes onto Hallendale's ship with Billy, Joji, Dooley and a few other crew members. Silver sees a ship in the distance. Flint notes that the ship is under British colors and is a pirate hunter. The ship pulls up next to The Walrus and Hornigold tells the crew that he will give them pardons if they surrender. Flint tells his crew that he could never surrender to England after they have taken so much from him. He says that England must be afraid of them if they are offering them all pardons. Flint then tells the crew that they are going to sail into the nearby storm. As Hornigold's ship is about to fire on The Walrus, Flint has the crew sail towards the storm and Hornigold follows him.
During the events of Black Sails: Season 3 Episode 2 XX. played by Andre Jacobs
Flint tells Billy that Hornigold will drive them into the storm and then retreat. De Groot asks Flint if they can lower the topgallants, but Flint thinks if they do, Hornigold will sense their weakness and continue chasing them.
Flint sees Hornigold turn back and orders the topgallants to be taken down. Billy asks Rogelio if the halyard is free and Murtaugh tells him that it is stuck. Murtaugh climbs to the top of the mast to cut the halyard and the ship is hit by a knockdown wave. Some of the men are knocked overboard and De Groot tells Flint that they must take the topgallant in. Flint cuts a rope and part of the mast breaks away and goes flying away with Murtaugh.
Flint tells Billy to have everyone go down below while Flint stays on deck to steer the ship. Later, De Groot tells Flint that the storm drove them into the Sargasso Sea. Billy tells Flint that they lost most of their fresh water and they have very little food. Flint asks how far the nearest coast is and Silver tells him that they are three weeks from land.
During the events of Black Sails: Season 3 Episode 3 XXI. played by Andre Jacobs
On day 18 on The Walrus, Palmer and Oates are accused of stealing rations. Silver holds a trial to figure out which one of them stole the rations. Oates insists he would never steal from the crew. Palmer says that during everything that has happened, he has never complained. Flint walks up and shoots Palmer in the head and then starts to reload his gun. Flint then shoots Oates in the head.
On day 21, Billy tells Flint that they spotted a whale carcass. De Groot says that whale's float after they rot, but Silver insists they go after it and tells Flint he is coming also. Silver and Flint bring a shark back to the ship and feed the crew with it. After the wind returns, the crew of The Walrus arrive at an island and go ashore.
During the events of Black Sails: Season 3 Episode 4 XXII. played by Andre Jacobs
The pirates from The Walrus are gathering water and food on the island while also making camp. A group of Maroons capture the rest of The Walrus crew. As they are being brought to the Maroon camp, Silver's leg goes out from under him and Twitchy Pirate tries to escape. Flint and his crew are brought to a village where they meet The Maroon Queen who demands to know who their captain is. She asks Flint what his name is and then asks who their quartermaster is. Silver steps forward and The Maroon Queen asks him how they found the island and who else knew where they were. She asks him if he was in her position if he would take the word of a pirate and then has one of the crew taken away while the rest of them are placed inside a cage.
During the events of Black Sails: Season 3 Episode 5 XXIII. played by Andre Jacobs
A group of maroons carry Mr. Scott ashore on a stretcher and Billy, who can't see who it is, asks Silver who is on the stretcher. Ben Gunn tells them that Mr. Scott is the king of the maroons. Later, Flint tells his crew about Mr. Scott's idea, but first he must convince The Maroon Queen to agree to the plan. He tells them that if he feels The Maroon Queen will not agree to the idea, then he will take The Maroon Queen hostage and force her to release his crew. Flint is brought before The Maroon Queen and Dr. Howell shows Billy the knife Flint was supposed to use to take The Maroon Queen hostage left on the ground. Afterwards, Billy and the rest of the crew are freed by Kofi.
During the events of Black Sails: Season 3 Episode 6 XXIV. played by Andre Jacobs
Dobbs starts yelling at a Maroon when a piece of the mast almost falls on a crew member. Flint asks what is the matter and Dobbs tells him that the Maroon's lashing came undone even though he just showed him how to do it. An island is spotted and De Groot hands Flint a spyglass and he looks out at Ocracoke Island. Flint and his crew land on the beach and are greeted by Blackbeard. Later, Blackbeard challenges Flint to fight with pistols and then swords over who shall claim the fleet.
Dooley and Ellers prepare Flint and Blackbeard's pistols. The Referee Pirate gives the rules of the engagement which includes no quarter given. In the first round, Flint manages to shoot Blackbeard in the temple, but Blackbeard manages to get up and attacks Flint with his sword. Blackbeard beats Flint in sword-fighting and as he is about to kill Flint, Vane steps in and forces Blackbeard back. Blackbeard then walks up to Flint and tells him take Vane with him and leave.
During the events of Black Sails: Season 3 Episode 7 XXV. played by Andre Jacobs
De Groot tells Flint that Nassau has been spotted. Silver goes to a tavern with Billy, Dooley and Joji. Once they are back on the ship word spreads among the crew about what Silver did to Dufresne. The next morning, De Groot calls to Flint. Flint looks to the beach and sees Woodes Rogers in a tent on the beach. Flint takes a boat to the beach and sits down in front of Rogers. Vane and Anne Bonny board The Walrus and explain their plan to Flint of getting Rackham back.
During the events of Black Sails: Season 3 Episode 8 XXVI. played by Andre Jacobs
Lookout spots ship sails and Silver tells De Groot to head back to shore.
During the events of Black Sails: Season 3 Episode 9 XXVII. played by Andre Jacobs
The Royal Lion continues to chase The Walrus. Leadsman calls out the surface depths to Dooley who then repeats it to De Groot. The Leadsman continues to yell out depths and De Groot tells Flint that both anchors are ready. Flint tells Mr. Williamson to hard to port and to drop the anchors and The Walrus turns to face the Royal Lion. The crew of The Walrus and the Maroons then unload the supplies.
During the events of Black Sails: Season 3 Episode 10 XXVIII. played by Andre Jacobs
Sails are spotted and De Groot tells Rackham and Anne that six ships are heading their way and De Groot thinks they are British reinforcements. Rackham tells Lookout to describe the ships and Rackham realizes that it is the pirate armada.
Rackham and Anne then go onto Blackbeard's ship and tell him of the British attack. Captain Chamberlain orders his ships to fire upon Blackbeard's ships and Anne and a small group of pirates jump into the water under cover of smoke. Hornigold's Boatswain has his men continue to fire upon Blackbeard's ship, but is then boarded by Anne and the pirates who kill him and his crew. Anne has the pirates fire on Hornigold's ship fire upon the British Navy ships. Chamberlain then retreats.