Burke (fine work by James Naughton) is forced to face two equally horrifying options after being captured by Urko's men: He'll either be killed by Urko (Mark Lenard in impressively angry and bullish form) or be used in a brainwashing experiment by brilliant prominent ape doctor Wanda (superbly played with ruthless intensity by Beverly Garland). Director Alf Kjellin, working from a riveting script by Richard Collins, relates the gripping story at a swift pace and builds a considerable amount of suspense. The interrogation scenes are quite quite brutal and harrowing while the climactic rescue of Virdon by Galen (the always on the money Roddy McDowall) and Virdon (solid Ron Harper) makes for an exciting set piece. Moreover, Galen has a funny moment in which he fools Urko's men by pretending to be a female chimp. The excellent acting by a tip-top cast keeps this episode buzzing: Anne Seymour as Galen's warm and supportive mother Ann, Norman Burton as Galen's gruff disapproving father Yalu, and Booth Colman as the wise Zaius. The robust score does the rousing trick. A very strong show.