Last episode: Town of Terror
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The guys arrive in a brick basement on the North Atlantic coast in 1978. It has advanced electrical equipment, and they are attacked by an overalled man. He collapses dead, then gets up and disappears in a cloud of smoke. They go upstairs and are paralyzed by an alien-android disguised as an old woman. The aliens are preparing to steal Earth's oxygen. The Project staff execute a lateral transfer and free the guys. They escape to a seemingly empty town surrounded by a force field and filled with paralyzed townspeople. A young couple, Paul and Joan, find the guys and tell them about the oxygen-stealing plot. Meanwhile the alien androids infiltrate the Project base, seal it off, and start sucking out the oxygen through the Tunnel itself. The guys must destroy the operation at their end. They fight off the androids and use explosives to blow up the alien HQ.
Aired: April 7, 1967

29. Raiders From Outer Space	March 31, 1967	0 Reviews	5.30
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28. The Kidnappers	March 24, 1967	1 Review	4.87
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27. Merlin the Magician	March 17, 1967	1 Review	5.85
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26. Attack of the Barbarians	March 10, 1967	0 Reviews	6.71
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  external: imdb.com Jul 21, 2007 (Score: 12)
  
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  external: tvparty.com Jul 21, 2007 (Score: 11)
  
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  external: wikipedia.com Jul 21, 2007 (Score: 9)
  
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  external: the time tunnel.com Jul 21, 2007 (Score: 7)
  

Lee Meriwether - Dr. Ann MacGregor James Darren - Dr. Tony Newman Sam Groom - Jerry John Zaremba - Dr. Raymond Swain Whit Bissell - Lt. General Heywood Kirk Robert Colbert - Dr. Douglas Phillips