Fan Casting Dr who and The Tenth Planet (1968)

The last in the Peter Cushing movie saga of Doctor Who. The Doctor and his companions Ben and Polly arrive in the TARDIS at the South Pole in the year 1986. They find themselves in the Snowcap Base, a space tracking station commanded by General Cutler. The base is supervising the mission of the Zeus IV spaceship, running a routine probe on the Earth's atmosphere. The spaceship is drawn off-course by an unknown force, and Snowcap monitoring staff discover a new, unknown planet approaching Earth. Recognising identical landmasses to those of Earth, the Doctor reveals that this is Mondas, the Earth's long-lost twin planet, and that its inhabitants will soon be visiting Earth.