This Week in USA
Colony In Space: Episode Four (HHH4)
Last updated 25 April 2026
10:30am-11:00am EDT (14:30 GMT) < > « »
Retro TV
Featuring: Jon Pertwee, Katy Manning, Tony Caunter, Roger Delgado, Bernard Kay, Morris Perry, John Ringham, Helen Worth
The Doctor discovers a doomsday machine left by a highly advanced civilization.
Synopsis Source: TVPassport listings
Broadcast Source: Retro TV