While the Fifth Doctor and Nyssa are in England investigating pop music the Sixth incarnation and Peri arrive in Russia and find themselves caught up in a Vostok rocket mission and a mystery surrounding the earliest history of space exploration. The Russians are sending a mission to the moon but they may not be the first to get there and one of their capsules has returned to earth with a very strange occupant.
Actually this one is rather good. Colin Baker is in fine form and his Doctor seems childishly excited to get on board a rocket. Meanwhile Peri is left behind to figure a way through all the different levels of intrigue at the control centre. Someone is a spy but who? There's some great sound design work as well and the rest of the cast are terrific. It's nonsense of course but great fun for all that.
4 out of 5 space dogs and on to The Assassination Games.