Season 2, Episode 21 Doomsday

First Aired: February 15, 1970

The earthlings try to thwart plans to destroy a city. Steve: Gary Conway. Mark: Don Matheson. Fitzhugh: Kurt Kasznar. Betty: Heather Young. Dr. North: Francine York. Valerie: Deanna Lund. Dan: Don Marshall. Kobick: Kevin Hagen. Warkin: Ed Peck.

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