William Allen Castleman directed Johnny Firecloud and The Erotic Adventures of Zorro, as well as composed the music for The Swinging Cheerleaders, The Adult Version of Jekyll & Hide, the 1974 The Wrestler, The Big Bird Cage, Trader Hornee, The Ecstasies of Women, Thar She Blows!, Space Thing, Nude Django, The Lustful Turk, The Acid Eaters, Ski on the Wild Side, She Freak, The Defilers, The Devil’s Mistress, Starlet!, Trader Hornee, ‘Gator Bait and At the End of the Rainbow. He also produced 7 Into Snowy and Chorus Call, so he was busy.

Written by Alvin L. Fast, who also wrote Moonshine Girls, Tom, Eaten Alive, Black Shampoo, Satan’s Cheerleaders and Angels’ Brigade, Bummer is about a rock band called The Group who are, well, out getting groupies. Their bass player, Butts (Dennis Burkley), goes nutzoid and starts killing people. First, he throws two of the girls in a shower and slaps them while calling them pigs. But you know, he owns the touring van. The limit comes when he kills people, starting with a groupie and the lead singer Duke (Kipp Whitman) before the other band aids get their revenge.

One of those girls is Carol Speed from Abby! Other ladies include Connie Strickland (The Centerfold Girls), who plays Barbara, the girlfriend of drummer Gary (David Buchanan); Dolly, who is Diane Lee Hart from The Pom-Pom Girls and Morely, The Group’s manager, who is Leslie McRay (Cleopatra in Death Race 2000).

Shot by Gary Graver, which makes this way better than it should be. It also has one of the most misogynistic taglines ever: ““You don’t have to rape a groupie… You just have to ask!”

David F. Friedman, the other producer, and Bob Cresse show up as cops at the end. As Herman Traeger, Friedman produced Ilsa and he was behind much of the soft core — and some hardcore — exploitation that made up the best of the form. Cresse wrote and produced most of those and shows up in them, often as a love camp commandant or as Granny Good in House On Bare Mountain. Cresse had a reputation for being tough, often carrying guns and with two bodyguards on his payroll. His career ended when he was walking his dog and saw two men beating a woman on Hollywood Boulevard. He pulled out a gun and ordered the men to stop. One of them said he was a cop and shot Cresse before killing his dog. The hospital stay that followed — he had no health insurance — ruined him.

You can watch this on Tubi.