meanwhile, clyde and rani explore the ruined london, reduced to rock formations and worked by human slaves who are led by the trickster's graske. the slaves are being made to mine resources so that the trickster may create a ship and extend his reach to the rest of the universe. clyde and rani implore the graske to help them restore the original timeline but he explains that if he did the trickster would punish him; years ago the graske had nearly died in space, but had been saved by the trickster in return for eternal servitude. clyde promises the graske that if he helps them, they will give him the puzzle box to free him from the trickster. the graske agrees and reopens the fissure so that rani can tell sarah jane the new information.