| "The Richest Man in the World"
| Season 3, Episode 17
| Air date
|| February 19, 1979
| Written by
|| Jackson Gillis, Anne Collins
|| Don McDougall
Diana must find a reclusive millionaire who is the only one who can help her with a secret device that scrambles missile-guidance systems.
- Lynda Carter as Diana Prince / Wonder Woman
- Lyle Waggoner as Colonel Steve Trevor, Jr.
- Jeremy Slate as Marshall Henshaw
- Roger Perry as Dunfield
- Del Monroe as Thug
- Carmen Zapata as The Prime Minister
- Barry Miller as Barney
- Marlyn Mason as Lucy DeWitt
- Joe Warfield as IADC Officer
- Buck Young as Foreman
- Joe G. Medalis as Lab Man
- Charles Young as Ambulance Attendant
- Bobby Baum as Cab Driver
- Tom Kratochvil as IRAC (voice)
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