Talk about it here.
In the 347th century, the family were still exiled from Raxacoricofallapatorius, although they expected a reappraisal in the coming thousand years. They were involved in the Platonic War, being among those defeated by the humans. To seek revenge, they employed Navarino technicians to build a temporal drive; the Slitheen ate them after it was completed. They travelled back to 1500 B.C., when Greece was facing famine. They gave them food, asking in exchange for champions to fight for them. The Slitheen were actually running a temporal tourist tour, with aliens coming to see the sites of future monuments and with the human fighters being killed for their entertainment. Their plan was for the humans to become dependent on them, never develop technology and never develop any advanced civilisation. The Tenth Doctor and June tried to stop them peacefully, but instead the native Greeks fought back, destroying their time travel technology and throwing the whole organisation into chaos. Mamps, Cosmo and Leeb Slitheen escaped, but were trapped in the past. When their time-travel package tour appeared to kill a tourist, they were taken to court and bankrupted. Police were sent back to capture Mamps, Cosmo and Leeb. (PROSE: The Slitheen Excursion)
Costmato Fel-Fotch Hangle-Wang Slitheen, Mamps Fel-Fotch Hangle-Wang Slitheen, Leeb Fel-Fotch Hangle-Wang Slitheen and Hisk Fel-Fotch Hangle-Wang Slitheen were members of the family operating in 1500 B.C. Greece. (PROSE: The Slitheen Excursion)