Possibly the worst Rock and Roll Horror Movie of all time, Apple Films' 1974 release Son of Dracula committed the historically unpardonable sin of being neither good, nor bad enough to be funny. But it wasn't for lack of trying; the film starred Ringo Starr as Merlin the Magician and Harry Nilsson as Count Down, Dracula's music-lovin' vampire son who is trying to go mortal. Ringo's first choice for the lead was David Bowie, but he settled for Nilsson, on the condition that he got his teeth fixed for the role. Also sticking their necks out for the cinematic disaster were Keith Moon, John Bonham, Peter Frampton, Nicky Hopkins and Beatles-pal Klaus Voorman.
Here's a clip including the crypt scene where Nilsson and the band lip synch their way through Jump Into The Fire, featuring Keith Moon (the song starts about 6:20 into this clip):
At least Ringo had no illusions. He was quoted by Q Magazine on the project in 1998:
I produced it for Apple. We had this script, Drac takes the cure, marries the girl and goes off into the sunlight - and it was the only movie we wanted to make. I called Harry because he was a blonde bombshell and we had his teeth fixed, which his mother was always thankful for. We had a lot of fun, there's a lot of musicians in it - John Bonham, Keith Moon, Peter Frampton. We had the premiere in Atlanta, the first movie since Gone With the Wind to open there, and we had 12,000 kids screaming, we had bands ... but we left town the next day, and so did everyone else. In America, the movie only played in towns that had one cinema, because it it had two, no matter what was on down the road, they'd all go there! It's a bit of a shambles now - we went into a studio with Graham Chapman and re-voiced a lot of it, so it makes even less sense now.