Blandly attractive rock star who invites his pals Fred, Velma, Daphne and Shaggy to the recording studio at Decade Records, where a KISS-looking phantom is causing trouble and songwriter Tony Signs has gone missing.
Jimmy's pianist and arranger is Ian Barkin.
The label owner's nephew Ace Decade is found out to be the disk demon when the gang figure out a song the phantom is after spells out A-C-E D-E-C-A-D-E in musical notes. He would have gotten away with it, too, if it hadn't been for those meddling kids.
From the "The Diabolical Disc Demon" episode (17 Nov. 1978) of The Scooby-Doo/Dynomutt Hour.