- Awesome, Dear Boy: David Warner approached Mark Gatiss about a possible role in the series.
- Fake Russian: All the Soviets are played by non-Russian actors.
- What Could Have Been:
- In a early draft the character of Professor Grinsenko was a villain.
- In the original script, the Ice Warrior Skaldak was a more complex creation: he was a time traveller from the thirty-first century who planned to provoke a nuclear war which would wipe out humanity, thereby preventing mankind from dominating Mars in his era. After mind-controlling the Doctor's new companion (at this point, a Victorian-era governess named Beryl) to further his scheme, Skaldak was ultimately killed by one of the Russians. The surviving crew escaped to a British sub, the Redoubt, while the sinking Russian vessel was destroyed by the water pressure.
- Several of the character names evolved during the adventure's development: the lieutenant was originally Tsarsko instead of Stepashin; the name Stepashin was earlier applied to the political officer (later Belevich); and Serovian, not Onegin, was the navigator.
- You Sound Familiar:
- Professor Grisenko is played by David Warner, who played the Doctor in two What If? audio stories: "Sympathy For The Devil" (also starring Mark Gatiss as the Master) and "Masters Of War". David Warner also played a professor in the Big Finish Doctor Who Ice Warriors episode "Deimos". His voice can also be heard in the animated Doctor Who serial "Dreamland".
- Nicholas Briggs adds another Doctor Who monster voice to his CV, having already voiced the Ice Warriors on audio since 2007.
Trivia / Doctor Who S33 E8 "Cold War"