2/4 The Doctor and Romana are taken to the tower and meet the three mysterious rulers.
1/4 The TARDIS lands on a world where the inhabitants live in fear of the Three Who Rule.
4/4 The Doctor finally uncovers the tragic truth of the Starliner.
3/4 The Doctor discovers that the Deciders have been perpetuating a lie to their own people.
2/4 The Doctor and K-9 are stranded when the TARDIS is stolen by the Marshmen.