Dunwell Atomic Research Station

In February 2065, it was reported that a mysterious masked man in black gained illegal entry into the Dunwell Atomic Research Station. He used a reactor after the alarm systems were put out of action before disappearing without a trace. (PROSE: Fireball Surrenders!)

Behind the scenes
The appearance of Dunwell Atomic Research Station in Fireball Surrenders! constitutes the first crossover between the Thunderbirds franchise and the Doctor Who universe.