When the entire universe seems to "blink," the Enterprise suspects invasion but finds only Lazarus, a man who seems to alternate between two different extremes of nature. In time, "he" is found to be two twinned beings locked in eternal struggle between their matter and anti-matter universes — a rift Kirk must help seal.
Mike and Robbie each have dates the same night. Due to a mix up in names, Mike picks up Robbie's young date (Trudi Ames), and Robbie picks up an older woman (Carole Costello), meant for Mike.
When the killer of his son is freed on a legal technicality, an irate father sets out to punish the criminal himself.
Hearing his father has died, Kimble risks a visit to his sister (Jacqueline Scott); guests James Daly, Lin McCarthy.
Mannix goes to what he believes is a meeting with a new client, but is ambushed by a gunman who accuses him of working for Bruno Raphael, a former crime boss now exiled from the United States.
