Paul Foster and his co-pilot Frank Craig are attacked by a UFO which infiltrates their minds and hypnotises them into wanting to kill Straker. Straker actually saves their lives when their craft is about to be destroyed, but, on their return to SHADO, Craig makes an attempt on Straker's life whilst Foster seeks to discredit him.
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https://www.youtube.com/watch?v=Lddb47Q7pmo
The Alphans fall into the grasp of the despotic Mentor, an alien scientist trying to restore his ravaged world to its former glory. His biological computer requires the energy obtained from living brains to complete his task. When captured, Koenig is offered a choice: surrender the Alphans to a horrifying living death or face complete annihilation. However, Mentor's beautiful daughter Maya, who is a metamorph and whom Mentor has concealed his actions from, may be able to aid the Alphans.
https://www.youtube.com/watch?v=dgbxmMa21Cg
Captain English permits Mr. Walkes to board his ship bound for Bali, only to learn Walkes is unwelcome at virtually every port - forcing English to endure his increasingly unwelcome guest.
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https://www.youtube.com/watch?v=pWLtTQTAXw8
Frank Bigelow, told he's been poisoned and has only a few days to live, tries to find out who killed him and why. Staring Edmond O'Brien, Pamela Britton, and Luther Adler.
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https://www.youtube.com/watch?v=tviAoQih6mc