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- Season 4 overviewSep 19, 1976-May 15, 197724 episodesSeason 4 episodes1. The Return of Bigfoot Sep 19, 1976
- A group of rebel aliens plans to build instruments capable of plundering Earth.
- 2. The Return of Bigfoot Sep 22, 1976
- Alien-controlled Bigfoot attacks Jaime as she helps Steve.
- 3. Nightmare in the Sky Sep 26, 1976
- Test pilot claims a Japanese zero shot down her plane.
- 4. Double Trouble Oct 3, 1976
- Enemy agents electronically control a nightclub comic.
- 5. The Most Dangerous Enemy Oct 17, 1976
- Dr. Wells becomes a psychopathic superman after a lab accident.
- 6. H Plus 2 Plus O Equals Death Oct 24, 1976
- Steve poses as a traitor to expose a spies that stole plans.
- 7. The Bionic Boy Nov 7, 1976
- Bionic Andy tries to clear his father's name.
- 8. The Bionic Boy Nov 7, 1976
- Steve watches over paralyzed teen given bionic limbs.
- 9. Vulture of the Andes Nov 21, 1976
- A Latin American woman is seen dropping homing devices from her sailplane during practice flights.
- 10. The Thunderbird Connection Nov 28, 1976
- Steve travels to the Middle East with the Air Force Thunderbirds to rescue an endangered prince.
- 11. The Thunderbird Connection Nov 28, 1976
- Steve travels to the Middle East with the Air Force Thunderbirds to rescue an endangered prince.
- 12. A Bionic Christmas Carol Dec 12, 1976
- Steve checks sabotage of a life support system for a Mars landing.
- 13. Task Force Dec 19, 1976
- Steve poses as a mercenary to stop traitors posing as GIs from stealing a secret missile.
- 14. The Ultimate Impostor Jan 2, 1977
- Steve's pal is the guinea pig in a computer experiment.
- 15. Death Probe Jan 9, 1977
- Steve rushes to Wyoming to destroy an out-of-control probe, built to explore Venus.
- 16. Death Probe Jan 16, 1977
- Steve joins Soviet experts to stop a Venus probe.
- 17. Danny's Inferno Jan 23, 1977
- Kidnappers stalk boy inventor of a new form of energy.
- 18. The Fires of Hell Jan 30, 1977
- A sheriff and a congressman sabotage an oil-drilling site; guests Ken Swofford, Bruce Glover.
- 19. The Infiltrators Feb 6, 1977
- Steve poses as an amateur boxer to track an assassination squad stalking athlete defectors.
- 20. Carnival of Spies Feb 13, 1977
- Steve has doubts about an East German scientist who left a conference complaining of heart problems.
- 21. U-509 Feb 20, 1977
- A blackmailer threatens to use nerve gas on thousands.
- 22. Privacy of the Mind Feb 27, 1977
- Soviets offer a scientist $1 million for few days' work.
- 23. To Catch the Eagle Mar 6, 1977
- Steve endures an Apache ritual to enter sacred grounds.
- 24. The Ghostly Teletype May 15, 1977
- The search for a vanishing formula makes Steve the target of telepathic brainwashing; guests Les Lannom, Linda Dano.