Guest Appearances
Some notable figures who made guest appearances on Sledge Hammer!:
- Adam Ant ("Icebreaker")
- Lewis Arquette ("Witless")
- Bill Bixby ("Hammer Hits the Rock") – Bixby also directed a number of episodes
- Mark Blankfield ("State of Sledge" and "Comrade Hammer")
- Bud Cort ("Last of the Red Hot Vampires")
- Bill Dana ("Haven't Gun, Will Travel")
- John Densmore ("State of Sledge")
- Michael Des Barres ("Sledgepoo")
- Sarah Douglas ("Play It Again, Sledge")
- Norman Fell ("They Call Me Mr. Trunk")
- Conchata Ferrell ("Jagged Sledge")
- Dennis Fimple ("They Shoot Hammers, Don't They?" and "If I Had a Little Hammer")
- Kurt Fuller ("Hammer Hits the Rock")
- Sid Haig ("Hammeroid")
- Mark Holton ("The Secret of My Excess")
- Clint Howard ("State of Sledge")
- Brion James ("If I Had a Little Hammer" and "Model Dearest")
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- Davy Jones ("Sledge, Rattle & Roll")
- Bernie Kopell ("Last of the Red Hot Vampires")
- Dan Lauria ("A Clockwork Hammer")
- Robin Leach ("The Spa Who Loved Me")
- David Leisure ("Hammer Hits the Rock" & "Magnum Farce")
- Peter Marshall ("To Live and Die on TV")
- Richard Moll ("Hammeroid")
- Ronnie Schell ("Hammer Gets Nailed")
- Armin Shimerman ("Hammeroid")
- Don Stark ("Under the Gun" and "Sledgepoo")
- Brenda Strong ("Miss of the Spider Woman")
- John Vernon ("Under the Gun" – parodying his role in the first Dirty Harry film)
- Ray Walston ("Big Nazi on Campus")
- Patrick Wayne ("Brother Can You Spare a Crime")
- Duane Whitaker ("Hammer Gets Nailed")
- Mary Woronov ("The Spa Who Loved Me")
- Brent Spiner ("The Spa Who Loved Me")
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Spencer himself made a Hitchcockian cameo appearance on the episode "Witless".
Actor Jackie Cooper had directed a few Sledge Hammer! episodes himself.