These cards are the stronger characters from the show, e.g. Davros, the Cult of Skaro and the Cybermen.
Crumhorns were used in Doctor Who and the Silurians as a theme for the reptile men and in his final score for the series, Revenge of the Cybermen in 1975, he made use of serpents and ophicleides whenever the Cybermen appeared.
Figures based off the first four series of the revival included variants of, the Ninth Doctor, the Tenth Doctor, companions such as Rose Tyler, Martha Jones, and Donna Noble, various secondary and minor characters, and alien enemies encountered such as Daleks, Cybermen, Slitheen, Autons, Clockwork Robots, Scarecrows, and Weeping Angels.
Nicholas Briggs and Barnaby Edwards provided Dalek voices and operation respectively, with Paul Kasey and others appearing on stage and in the auditorium as monsters from the series including Clockwork Droids, Cybermen and Ood.
Their interest in the problems of science changing and endangering human life had led them to create the popular alien race the Cybermen for that programme, and it was similar interests that led them to create Doomwatch, which explored all kinds of new and unusual threats to the human race, many bred out of the fear of real scientific concepts, with a "this could happen to us" fear by the public.
It has been speculated that Davies loosely adapted elements from The Flood in his later DW storylines The Parting of the Ways and Army of Ghosts (in particular the Doctor absorbing the time/space vortex to save Rose Tyler's life, triggering his regeneration and the ghost-shifting infiltration of The Cybermen on an unsuspecting public)
One of his music pieces, "Space Adventure" was used in the "Doctor Who" serial, "The Tenth Planet" as the Cybermen's theme.
The monthly series of comic strips written by Alan Barnes and drawn by Adrian Salmon, The Cybermen (DWM no. 215–238) ignored this and took place on an unspoiled version of Mondas.
The Eighth Doctor, having left Sam Jones at a Greenpeace rally, responded to the Dreadnoughts distress call and defeated the Cybermen, but not in time to save the ship's crew, except Stacy.
The Cybermen have engineered the star in Messier 13 to go nova, forcing the Wheel crew to look to their bernalium stores only to find them missing.