The Sixth Doctor and Mel come up against an impostor Doctor and his companion Sally-Anne.
During the serial, the Doctor and his companions undertake a quest to find the three greatest treasures of the Generios system.
The story was essentially Big Finish's Christmas panto, and features an extra Christmas scene as a hidden track at the end of the story. The episodes are heavily laden with comedy and the impostor Doctor's name, Banto Zame, is an intentional rhyme with Panto Dame.