Alpha Male
Background
Alpha Male is the leader of a hive of Infected. He is mates with the Alpha Female.
During the events of I Am Legend (2007) played by Dash Mihok
Alpha Male roars at Robert Neville when Robert captures Alpha Female. He sets a trap for Robert and as the sun goes down, sics three Infected dogs on Robert. He sends a large group of Infected after Robert when Robert ambushes them during the night. He eventually finds out where Robert lives and breaks into his home. He follows Robert down into his lab and repeatedly slams his head into the Plexiglas surrounding a room holding the Alpha Female. After finally breaking through, Robert charges at the Alpha Male and detonates a grenade, killing them both. Or alternately Robert realizes the Alpha Male and Alpha Female are mates and give the Alpha Female back to Alpha Male and the Alpha Male leaves with the Alpha Female.