The TARDIS materialises on the runway of Gatwick Airport, where Polly witnesses a murder only to be kidnapped before she can report it.

With Polly having apparently forgotten them, the Doctor, Ben and Jamie decide to carry out their own investigation of Chameleon Tours.

Jamie finds himself aboard the Chameleons' satellite and meets their Director while the Doctor forces the Chameleon Meadows to tell him the aliens' plans.