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|George Hamilton||Professor Jim Tanner|
|Suzanne Pleshette||Professor Margery Lansing|
|Richard Carlson||Prof. Norman E. Van Zandt|
|Yvonne De Carlo||Mrs. Sally Hallson|
|Earl Holliman||Prof. Talbot Scott aka Scotty|
|Gary Merrill||Mark Corlane|
|Arthur O'Connell||Prof. Henry Hallson|
|Nehemiah Persoff||Prof. Carl Melnicker|
|Michael Rennie||Arthur Nordlund|
|Miiko Taka||Mrs. Van Zandt|
|Celia Lovsky||Mrs. Hallson|
|Vaughn Taylor||Mr. Hallson|
|Beverly Powers||Sylvia, party girl (as Miss Beverly Hills)|
"YOU feel it until you can't feel anything at all!"
Professor Jim Tanner, a biochemist, discovers evidence of a person with psychic abilities among his co-workers in a research laboratory. His colleagues include geneticist Margery Lansing, physicist Carl Melkinen, biologist Talbot Scott and chairman N.E. Van Zandt, all working for Navy officer Arthur Nordlund.After a warning from Professor Henry Hallson that one among them possesses a super-intelligence capable of destruction and mind control, Hallson is found murdered with the name "Adam Hart" scrawled nearby. His widow Sally Hallson says it is the name of a childhood friend.Tanner is the prime suspect of a police investigator named Corlane. As he tries to uncover the superhuman, Tanner's associates are methodically murdered, Scott ultimately being shot by Corlane. Tanner then faces a showdown with the killer, an apparently undefeatable opponent. Nordlund is revealed to be Adam Hart. Hart's psychic assault awakens Tanner's own latent psychic powers, and Hart is killed by him. Tanner realizes that he was the superhuman uncovered by Hallson's tests, and that Hart was trying to eliminate any competition from others like himself.