Therefore, its known narrative elements are not a part of the Doctor Who universe. It may have been the basis for a similar story in another medium, however — and that story may indeed be a part of the DWU.
|Adapted into:||Thin Ice|
|Companion(s):||Ace, Sam Tollinger|
|Main enemy:||Ice Warriors|
|Format:||Unproduced TV story|
|Earth Aid||Crime of the Century|
This was to have been Ace's final story with the program. The story was to have been a four part story featuring two rival factions of Ice Warriors battling in 1960s London. The setting at first was to have been a terraformed Mars, but Andrew Cartmel requested it be changed to 1960s London.
Ideas that Platt had proposed included the use of hippies, a more mystical bent to the Ice Warriors, and a mind-controlled biker gang with helmets resembling those of the Warriors'. Due to John Nathan-Turner wanting to use the London Dungeon tourist attraction as a location, it was going to revealed that one of the exhibitions there was an Ice Warrior's armour. 
This story would have also introduced Sam Tollinger, a friend of the Doctor's who would reappear in several stories, and through him lead directly in the next story, Crime of the Century.
- The reason for Ace's departure was to have been that the Doctor wished to enrol her in the Prydonian Academy on Gallifrey to become a Time Lord. Ideas like this appeared in WC: Death Comes to Time.
- In PROSE: Set Piece, the Doctor mentioned to Ace that he considered taking her to Gallifrey to learn to become a Time Lord.
- There was to have been a 'hippy character' living in a canal boat. Both the setting and a character such as this appeared in Marc Platt's HOMEVID: Downtime.