After rescuing the failed inter-galactic mission sent out by the Council of Earth and Mars, Tardis brings Doctor Who and his friends to the planet Rhoos. They materialise on a weird plain that turns out to be the hand of the evil Cyclops, Fo. He has been sleeping through all this, but now wakes and departs, taking Tardis with him. As the Doctor and three of his companions (Hill, Shelley and Chertzog) fly around in their contra-gravity suits on a recce, they are captured by a mysterious spaceship.