Season 3 - Episode Guide

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

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

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

A crooked real-estate speculator 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 steals an Irish cobbler's 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 body.

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

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

A fanatic 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.

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

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

A thief plans to use a jinxed girl in his plot to steal priceless historical documents.

A boy 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.

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

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

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