What could possibly go wrong on Professor Bernice Summerfield's investigation into the lost civilisation of Perfecton? Nothing, it seems - until they leave the planet and spot a dirty great missile heading towards their ship. But instead of oblivion, Benny finds herself plunged into the strange world of - panto. Written by Paul Cornell. Directed by Nicholas Briggs. Cast: Lisa Bowerman (Bernice Summerfield); Nicholas Courtney (Wolsey the Cat); Jo Castleton (Jayne Waspo/Bitchy); Jonathan Brüün (Michael Doran/Cute); Colin McIntyre (Captain Balsam/King Rupert); Nicholas Briggs (Lt Prince/Prince Charming); James Campbell (Professor Candy/Dame Candy); Mark Gatiss (The Grand Vizier); Alistair Lock (The Grel Master).