Tommy Kirk in the beach movie It's a Bikini World (1967).
He recorded many songs, mostly horror parodies: "The Werewolf Watusi," "Monster Man Jam," "Monsters on the Prairie." But his biggest claim to fame was the novelty-horror song "The Monster Mash" by "Boris" Bobby Pickett and the Crypt-Kickers, which sprang to the top of the charts in 1962, 1970, and 1973.
It has been covered by everyone from Boris Karloff to Alvin and the Chipmunks, heard on every tv series from Cheers to The Office.
There's a video on youtube starring more explicitly gay versions of the monsters: they hug, hold hands, and collapse into each other's arms.
Bobby Pickett died in 2007.
See also: Jozin z Bazin, the Czech Swamp Monster.