Monstrosity is a 1963 American science fiction horror film produced by Jack Pollexfen and Dean Dillman Jr. and directed by Joseph V. Mascelli.

In an atomic-powered laboratory beneath the mansion of the elderly, unpleasant, and very rich Mrs. Hettie March, Dr. Otto Frank is experimenting with brain transplantation.

Things are not going very well, though, as all Dr. Frank has succeeded in creating so far is Hans, a snarling man-beast with a dog's brain, and the "Walking Corpse" – a pretty young woman who wanders about the lab with a brain-dead glassy-eyed stare.

To that end, Mrs. March advertises for domestic help and hires Nina Rhodes from Austria, Bea Mullins from England, and Anita Gonzales from Mexico.

Now a cat, Mrs. March is quite unhappy about this unexpected development, and after scratching Dr. Frank's hand in anger, locks him inside his atomic-powered experimental chamber when he enters it.

In an interview with film historian Tom Weaver, Pollexfen said that Monstrosity "was shot around '58, with fundamentally an amateur cast."

Academic Bonnie Noonan took an in-depth look at Monstrosity in her book Gender in Science Fiction Films 1964-1979: A Critical Study.

Victor (Frank Fowler), whom Noonan refers to as Mrs. March's "longtime male companion," is "not depicted as a man worthy of high regard."

as Victor ogles the Walking Corpse, "a drooling girl whose dead body has been reanimated," he mutters lecherously, "She doesn't have a brain.

In his opinion, "it's difficult to distinguish the zombies from the other actors," and he points out that Nina, Bea, and Anita lose their foreign accents half-way through the film.

The anonymous reviewer points out that Xerxes, already with Mrs. March's brain, provides the climax of the movie as she/he "takes advantage of Dr. Frank entering his atomic chamber by locking him in and flipping the switch, frying the man alive.

"[12] In Zombiemania: 80 Movies to Die For, academic and author Arnold T. Blumberg wrote that the "Mystery Science Theater 3000 version is the only watchable one.

"[13] Under the title The Atomic Brain, the film was shown in episode #518 of Mystery Science Theater 3000, first airing on 4 December 1993.

"[15] The MST3K version of the film was released by Rhino Home Video as part of the Mystery Science Theater 3000 Collection, Vol.

[17] The play is described as "perfect for high schools and community theatres," with "several strong female roles," "content suitable for all ages," and "dancing cats!