The Other Side of the Underneath is a 1972 British experimental psychological drama film written and directed by Jane Arden and starring Sheila Allen, Suzanka Fraey, Liz Danciger, Ann Lynn, and Penny Slinger.

[citation needed] The title of the film is taken from a line in Arden's play Vagina Rex and the Gas Oven, which was a huge success at the London Arts Lab in 1969.

[1] The film had almost mythical status amongst fans of radical, experimental cinema, partly because of its visionary and disturbing depictions of the mental state of its schizophrenic protagonist, and also its unavailability.

Juxtaposing visions of personal hell with group psychotherapy sessions, The Other Side of the Underneath is an unsettling experience and provides an illustration of the idea that insanity is a kind of death that must be followed by rebirth.

The extraordinary soundtrack to the film was primarily the work of the cellist Sally Minford, who appears, actually playing the cello, in many interior and exterior scenes, and the sound editor Robert Hargreaves.