A twin (Leif Garrett) steps in to sing for his teen-idol brother, kidnapped by a master criminal (Albert Paulsen); guest Dawn Lyn.
Diana teams up with an undercover detective (Peter Brown) to bust a ring specializing in rare antique cars; guest Lance LeGault.
Steve and Diana look into a rash of football victories by underdogs; guests Ron Ely, Roman Gabriel, Deacon Jones, Craig T. Nelson.
Diana begins to suspect a link between an artist's (Roddy McDowall) amazingly lifelike sculptures and a recent rash of art thefts.
Diana enlists the aid of a psychic (Paul Sand) to counteract the effects of another psychic stealing secrets from scientists' minds.
A woman (Lorene Yarnell) calling herself Formicida sends ant armies to attack factories producing a dangerous, unstable pesticide.
The female half of a pair of time-travelers (Joan Van Ark, Ted Shackelford) from the year 2155 plans to destroy the city of Phoenix.
A teen skateboard wiz (Cynthia Eilbacher) gets mixed up with a mobster who wants to turn the girl's home town into a gambling mecca.
A crooked real-estate speculator (Nicholas Coster) plans to use a trained dolphin to sink an oil tanker.
Thieves plan to impersonate Wonder Woman and her colleagues to steal jewels at a high-society party.
A crook (Brian Davies) steals an Irish cobbler's (Dick O'Neill) gold to purchase $100 bill printing plates from a counterfeiter.
An aged industrialist has his brain preserved after his death for transferral to a young man's (David Mason Daniels) body.
A laser expert (Hari Rhodes) uses a holographic image to trick a Soviet pilot into jettisoning a warhead, later offered for sale.
The thief (Rene Auberjonois) of a secret laser crystal conceals himself among costumed attendees at a science-fiction convention.
A fanatic (Andrew Duggan) plans to start a nuclear war by using his own television station to simulate attacks by alien spaceships.
Diana poses as a singer to expose an extortion ring in the record business; guests Judge Reinhold, Sarah Purcell, Rick Springfield.
An international incident looms after thieves kidnap a wealthy man and steal a missile-guidance system he sold to a foreign power.
A thief (Donnelly Rhodes) wearing another man's face steals a vial containing a deadly virus that could destroy millions of people.
A thief (Raymond St. Jacques) plans to use a jinxed girl in his plot to steal priceless historical documents; guest Charles Haid.
A boy (Clark Brandon) from a town where aliens are taking over everyone sees Diana change herself into Wonder Woman.
Diana discovers the invading aliens are taking over human bodies to allow them to capture an evil, criminal being.
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