When Professor Braintree disappears, his wife calls her Doctor for advice. Whilst giving Faith some counselling, an attempt is made on Keel's life - somebody thinks he is the Professor! Steed's plan to use Keel as bait brings the Doctor close to death on an operating-table, before the killer is unmasked and the Professor, unaware of all the fuss, returns home after suffering from temporary amnesia.

Cast & crew * mug shots in sepia denote images sourced from other productions.

not billed in TV Times magazine
Williams	Gordon Boyd
Dr David Keel	Ian Hendry {Dangerman}{New Avengers}{Police Surgeon}{The Saint}{The Sweeney}{regular}
Carol Wilson	Ingrid Hafner {Police Surgeon}{regular}
Faith Braintree	Helen Lindsay {Police Surgeon}{regular}
Commander Reece	Michael Logan {The Sweeney}
John Steed	Patrick Macnee {New Avengers}{007}
Dr Brown	Robert Bruce {The Saint}
Dr Jones	Redmond Bailey {regular}
Dr Miller	Robert Sansom {The Saint}
Professor Braintree
crew
Teleplay by	Terence Feely {The Saint}{The Prisoner}{New Avengers}{Space 1999}{UFO}
"The Avengers" Theme composed and played by	Johnny Dankworth
Designed by	Robert Fuest {New Avengers}
Producer	Leonard White {Callan}{Police Surgeon}
Directed by	Peter Hammond

The Avengers

Season 1, 1961 - Episode 4

Nightmare

by Terence Feely

Cast & crew * mug shots in sepia denote images sourced from other productions.