Episodes:

144 1 Time and the Rani - September 1987

Whilst in flight, the TARDIS is attacked by the Rani, an amoral scientist and renegade Time Lord. The TARDIS crash-lands on the planet Lakertya. On the floor of the console room, the Sixth Doctor regenerates into the Seventh Doctor. In his post-regenerative confusion the Doctor is separated from Mel and tricked into assisting the Rani in her megalomaniac scheme to construct a giant time manipulator.

Sylvester McCoy – Seventh Doctor
Bonnie Langford – Mel Bush

Kate O'Mara – The Rani
Mark Greenstreet – Ikona
Donald Pickering – Beyus
Wanda Ventham – Faroon
Karen Clegg – Sarn
Richard Gauntlett – Urak
John Segal – Lanisha
Peter Tuddenham, Jacki Webb – Special Voices

1145 2 Paradise Towers - October 1987

The Seventh Doctor and Mel, looking for a swimming pool, land in Paradise Towers, a luxurious 22nd-century high-rise apartment building now fallen into disrepair and chaos. It is divided between the Caretakers who maintain the building and roaming gangs of young girls called Kangs, grouped in colour theme; the Doctor and Mel encounter the Red Kangs.

The Chief sends a squad of Caretakers to arrest the Red Kangs and in the ensuing confusion the Doctor is split from Mel and captured by the Caretakers. Mel meanwhile heads off to an apartment in which two elderly residents ("rezzies") live. Tilda and Tabby explain that all the able-bodied residents left the Towers to fight a war, leaving behind only children and the elderly. The only other man still loose in the Towers is Pex, a would-be hero, who appoints himself Mel's guardian.

Sylvester McCoy – Seventh Doctor
Bonnie Langford – Mel Bush

Richard Briers – Chief Caretaker / The Great Architect
Clive Merrison – Deputy Chief Caretaker
Elizabeth Spriggs – Tabby
Brenda Bruce – Tilda
Judy Cornwell – Maddy
Howard Cooke – Pex
Julie Brennon – Fire Escape
Annabel Yuresha – Bin Liner
Catherine Cusack – Blue Kang Leader
Astra Sheridan – Yellow Kang
Joseph Young – Young Caretaker
Simon Coady – Video Commentary

146 3 Delta and the Bannermen - November 1987

On an alien planet the genocide of the Chimeron by the merciless Bannermen led by Gavrok is almost complete. The last survivor, Chimeron Queen Delta, escapes clutching her egg, the future of her species. She reaches a space tollport where the Navarinos, a race of shape-changing tourist aliens, are planning a visit to the planet Earth in 1959 in a spaceship disguised as an old holiday bus. She stows aboard, meeting Mel, while the Seventh Doctor follows in the TARDIS. The Doctor and Mel won the trip as a prize for arriving in the Navarino spaceport in time to be declared the ten billionth customers. As the tourist vehicle departs, the Bannermen arrive to hunt down the fugitive, and they kill the tollmaster.

Sylvester McCoy – Seventh Doctor
Bonnie Langford – Mel Bush

Don Henderson – Gavrok
Belinda Mayne – Delta
Richard Davies – Burton
Stubby Kaye – Weismuller
Morgan Deare – Hawk
David Kinder – Billy
Martyn Geraint – Vinny
Sara Griffiths – Ray
Hugh Lloyd – Goronwy
Ken Dodd – Tollmaster
Brian Hibbard – Keillor
Johnny Dennis – Murray
Leslie Meadows – Adlon
Anita Graham – Bollitt
Clive Condon – Callon
Richard Mitchley – Arrex
Tim Scott – Chima

147 4 Dragonfire - November 1987-December 1987

The Seventh Doctor and Mel arrive at the trading colony Iceworld on the dark side of the planet Svartos. They soon run into Sabalom Glitz, who is on Svartos to work off a debt that he owes to the crime lord Kane, and is preparing to explore the depths of Svartos to locate a treasure reportedly protected by a dragon, aided by a map given to him by Kane; in exchange, Kane will return Glitz' ship, the Nosferatu, and clear him of his debts. The Doctor and Mel offer to help, but Glitz asserts the expedition is too dangerous for Mel, and she stays behind at a local diner. She befriends Ace, a young woman who turns out to have actually come from 20th-century Earth, propelled forward in time when a mysterious time storm appeared in her bedroom while she was trying to experiment with "Nitro-9", an explosive of her own creation. The two eventually become weary of waiting and follow the Doctor and Glitz.

Sylvester McCoy – Seventh Doctor
Bonnie Langford – Mel Bush
Sophie Aldred – Ace

Tony Selby – Sabalom Glitz
Edward Peel – Kane
Patricia Quinn – Belazs
Tony Osoba – Kracauer
Stephanie Fayerman – McLuhan
Stuart Organ – Bazin
Chris MacDonnell – Arnheim
Nigel Miles-Thomas – Pudovkin
Sean Blowers – Zed
Ian MacKenzie – Anderson
Shirin Taylor – Customer
Miranda Borman – Stellar
Leslie Meadows – The Creature
Daphne Oxenford – Archivist
Lynn Gardner – Announcer