Tommy Kirk leads his fellow Martians to Earth on an interplanetary quest for females. Kirk proves that Martians have impeccable taste when one of his first conquests turns out to be sexy scientist Yvonne Craig.

The Dallas trial of Lee Harvey Oswald, President John F. Kennedy's alleged assassin, is enacted as it might have occurred. After the defense enters pleas of "not guilty" and "not guilty by reason of insanity," 23 witnesses for the prosecution testify. No verdict is returned.

A mad stage hypnotist Dr. John Basso reverts his beautiful assistant Doreena into the physical form of a prehistoric sea monster she was in a past life. Using this power he attempts to find fame and fortune by predicting a series of murders and then using the monster to carry them out.