The first episodes sees Michelle Ryan playing the mysterious Lady Christina de Souza, who joins the Doctor on a bus-trip which takes a very unexpected detour into danger, while British comedy star Lee Evans also joins the cast playing a character called Malcolm whose life becomes connected to the Doctor’s under extraordinary circumstances…

When a London bus travels through a worm-hole to an alien world, the Doctor must join forces with the extraordinary Lady Christina to help the unfortunate passengers, and themselves, get back home. But the mysterious planet holds terrifying secrets hidden in the sand, and time is running out, as the deadly swarm gets closer…