Deep dive of the film The Exorcist.

When young Regan (Linda Blair) starts acting odd -- levitating, speaking in tongues -- her worried mother (Ellen Burstyn) seeks medical help, only to hit a dead end. A local priest (Jason Miller), however, thinks the girl may be seized by the devil. The priest makes a request to perform an exorcism, and the church sends in an expert (Max von Sydow) to help with the difficult job.

Directed by William Friedkin
Screenplay by William Peter Blatty
Starring
Ellen Burstyn
Max von Sydow
Lee J. Cobb
Kitty Winn
Jack MacGowran
Jason Miller
Linda Blair