Korst Gogg Thek Lutiven-Day Slitheen

Hal Go Hetch Lutiven-Day Slitheen was the son of Kist Mag Thay Lutiven-Day Slitheen. He was part of the operation of a family Slitheen to turn off the Sun. He had posed as the fat kid loser, Carl. When Sarah Jane Smith intervened, Hal Go Hetch had teleported away as the machine failed, killing the rest of his family.

Hal Go Hetch Lutiven-Day Slitheen is due to return in The Lost Boy.