The TARDIS lands in a space museum on Earth in the late 21st century, where the Second Doctor, Jamie and Zoe learn that contact has been lost between Earth and the Moon. In this era, instant travel — T-Mat — has revolutionised the Earth. Its people have lost interest in space travel. The Doctor and his companions travel to the Moon in an old-style rocket and reach the Moonbase, control centre for T-Mat, only to find a squad of Ice Warriors have commandeered the base and plan to use the T-Mat network to their advantage.
Patrick Troughton
as The Doctor
Frazer Hines
as Jamie McCrimmon
Wendy Padbury
as Zoe Heriot
Ronald Leigh-Hunt
as Commander Radnor
Louise Pajo
as Gia Kelly
Philip Ray
as Professor Eldred
Terry Scully
as Fewsham
Ric Felgate
as Brent
Harry Towb
as Osgood
Christopher Coll
as Phipps
Martin Cort
as Locke
Hugh Morton
as Sir James Gregson
