Leon begs his disfigured twin (Jared Martin in dual roles) to release the orphan (Ike Eisenmann) he has befriended.

A man peddling U.S. secrets abroad wants to use an amusement park as a base, but the owner (Jared Martin) won't sell.

A scientist develops an injection that makes animals super-strong and invulnerable, then tries the formula on a human (Bob Seagren).

Diana discovers the invading aliens are taking over human bodies to allow them to capture an evil, criminal being.

A boy from a town where aliens are taking over everyone sees Diana change herself into Wonder Woman.

A thief plans to use a jinxed girl in his plot to steal priceless historical documents.

A thief wearing another man's face steals a vial containing a deadly virus that could destroy millions of people.

An international incident looms after thieves kidnap a wealthy man and steal a missile-guidance system he sold to a foreign power.

Diana poses as a singer to expose an extortion ring in the record business.

A fanatic plans to start a nuclear war by using his own television station to simulate attacks by alien spaceships.

The thief of a secret laser crystal conceals himself among costumed attendees at a science-fiction convention.

A laser expert uses a holographic image to trick a Soviet pilot into jettisoning a warhead, later offered for sale.

An aged industrialist has his brain preserved after his death for transferral to a young man's body.

A crook steals an Irish cobbler's gold to purchase $100 bill printing plates from a counterfeiter.

Thieves plan to impersonate Wonder Woman and her colleagues to steal jewels at a high-society party.

A crooked real-estate speculator plans to use a trained dolphin to sink an oil tanker.

A teen skateboard wiz gets mixed up with a mobster who wants to turn the girl's home town into a gambling mecca.

The female half of a pair of time-travelers from the year 2155 plans to destroy the city of Phoenix.

A woman calling herself Formicida sends ant armies to attack factories producing a dangerous, unstable pesticide.

Diana enlists the aid of a psychic (Paul Sand) to counteract the effects of another psychic stealing secrets from scientists' minds.

Diana begins to suspect a link between an artist's (Roddy McDowall) amazingly lifelike sculptures and a recent rash of art thefts.

Steve and Diana look into a rash of football victories by underdogs; guests Ron Ely, Roman Gabriel, Deacon Jones, Craig T. Nelson.

Diana teams up with an undercover detective (Peter Brown) to bust a ring specializing in rare antique cars; guest Lance LeGault.

A twin (Leif Garrett) steps in to sing for his teen-idol brother, kidnapped by a master criminal (Albert Paulsen); guest Dawn Lyn.