The third video set of Space: 1999 contains three more first-season episodes from Thunderbirds creators Gerry and Sylvia Anderson's 1975 British series. The premise of this sci-fi cult classic is that Earth's moon was blasted out of orbit, sending the crew of Moonbase Alpha on an unexpected interplanetary journey, looking for a place they can call home. The castaways on Moonbase Alpha, led by Commander John Koenig (Martin Landau), continue their drift through the universe, where they encounter fantastic planets, oddball races, and cataclysmic perils. In "Missing Link" Koenig is abducted by aliens; "Guardian of Piri" has Alpha's computers reporting to a skeptical crew that Piri is the planet they've been searching for; and in "Force of Life" a strange power begins leeching energy from both man and machine. Space: 1999's then state-of-the-art special effects hold up well, less so the deliberate pacing. But these fan-favorite episodes are a must for all earthbound Alpha devotees. --Jenny Brown