"Mad Magazine" creator Harvey Kurtzman penned the script (with writer Len Korobkin) and "Mad" artist Jack Davis designed many of the characters. Davis was a natural for the job, being famous both for his humor work and his monster stories in the pages of EC Comics. It has long been rumored that Forrest J. Ackerman had a hand in the script, but while the dialogue is rife with "Famous Monsters of Filmland"-like puns, Ackerman's involvement has never been confirmed and his name never appeared in the on-screen credits or in original promotion for the film at the time of its release. In fact, Rankin/Bass historian Rick Goldschmidt, in liner notes accompanying the Anchor Bay DVD release, denied Ackerman was ever involved, at the same time as the DVD packaging promoted Ackerman's name. Goldschmidt repeated his claims on this in a 2006 blog entry, based on his interviews with Korobkin, who claimed to have written the original screenplay, which then was revised by Kurtzman, but never worked with Ackerman.