Season 24 episodes

No   Code   Title                    First Shown  Eps  Exists
-------------------------------------------------------------
Seventh Doctor - Sylvester McCoy
147   7D    Time and the Rani         7 Sep 87     4    all
148   7E    Paradise Towers           5 Oct 87     4    all
149   7F    Delta and the Bannermen   2 Nov 87     3    all
150   7G    Dragonfire               23 Nov 87     3    all

Notes

Quite when Melanie became a companion is not explained, she was a companion in a vision of the Future during the Trial of a Time Lord and suddenly appeared at the end of it in the present time. Melanie leaves and Ace joins during Dragonfire.

Episode Details

Time and the Rani

Still unstable from his regeneration at the end of the trial, the Doctor is deceived by the Rani into believing she is his companion, and she tricks him into helping her build a powerful new weapon. Meantime, Mel is on the run and befriends the meek enslaved population of the planet on which the Rani is making the Doctor work for her.

Paradise Towers

The Doctor and Mel land in a giant tower block now in a degenerate state of decay, with its inhabitants grouped into warring factions. The whole is presided over by a megalomanic caretaker, who seeks the destruction of all the inhabitants. Can the Doctor persuade the factions to unite against the common enemy and his killing machines?

Delta and the Bannermen

The Doctor and Mel encounter a space craft that looks like a 1950s bus, which is taking tourists to visit Disneyland. Unfortunately, the Chimeron Queen Delta is on board the bus, escaping from a band of murderous mercenaries (the Bannermen) who were hired to destroy the Chimeron race. After a Bannerman attack on the space bus, it crash lands in a South Wales holiday camp called Shangri-La. After Delta escapes, the Bannermen attack again, killing all the tourists. Can the Doctor save her with the aid of a young mechanic, a local bee keeper and 2 US secret service agents?

Dragonfire

The Doctor and Mel arrive on Ice World, a deep space trading post and are reunited with Sabbalom Glitz who joins them in search of the mythical Dragon. Mel befriends a waitress called Ace who is rather keen on explosives. The Doctor finds the Dragon and collects the power crystal from it, but is forced to give it to the crazed ruler of Ice World, Kane, in order to save Ace's life.