With the Doctor and Jo being held prisoner, the Master convinces Mailer to help him steal the Thunderbolt.
Did You Know?
The colour master videotape was wiped by the BBC in the 1970s and although colour versions were sold overseas, only 16mm black-and-white film prints were retained by BBC enterprises. However, this episode was restored to colour for the DVD release in 2013 using the chroma dots discovered in the film prints. See more