I think the worst movie MST3K ever touched was Monster A Go-Go
Watching that film make me appreciate the story that Manos told, which at least had a beginning, a middle and an end.
Monster A Go-Go is such an incomprehensible mess that I couldn't follow it at all, and it turned out to be one of the weaker episodes of MST3K as well because I felt like they didn't even know what to do with it.
Monster A Go-Go, back in 1961 midwest auteur Bill Rebane started work on a 50’s-style monster rampage picture by the somewhat odd name of
Terror at Halfday. It was a remarkably ambitious production, with a climax that called for swarms of soldiers, cops, and firemen, together with their vehicles and equipment, taking over the subterranean portion of Chicago’s street grid between Lake Shore Drive and Wabash Avenue, south of the Chicago River.
Terror at Halfday required airplanes, helicopters, and laboratory spaces that could not be faked with stock footage, not to mention a full-scale prop space capsule. The monster was supposed to be so tall that only a circus giant would suffice to play it. And Rebane proposed to do it all on a budget of just $60,000. Not surprisingly, he ran out of money before
Terror at Halfday was anywhere close to finished, and he never did scrape together the funds to complete the project. The nearest Rebane ever came to recouping his costs was the $8000 he received from Herschel Gordon Lewis in 1965, when Lewis bought about two hours’ worth of silent
Terror at Halfday footage (counting coverage and outtakes) with the aim of turning it into a supporting feature for his forthcoming
Moonshine Mountain. Herschel Gordon Lewis filmed new scenes years later, dropping characters whose “actors” were unavailable.
Bill Rebane was unable to finish his first movie,
Herschel Gordon Lewis did it for him.
Monster a Go-Go is like a mash up of horrible Midwestern exploitation filmmaking.
It almost becomes postmodern enough to be interesting, but not quite. Oddly even the DVD is lousy, with a stupid commentary by “director” Rebane that blames his problems on “unions,” while Lewis also tried the “it’s supposed to be funny” cop-out.