• title card: The Deadly Air superimposed on a close-up of Dr. Karswood
  • publicity still: Steed chats up Barbara
  • publicity still: Steed and Dr. Keel question Dr. Harvey
  • publicity still: Heneager attacks Armstrong
  • publicity still: Dr. Kilbride takes time out from his yoga to talk to Dr. Keel
  • Steed, thinking himself infected and self-quarantined, peers out the porthole as Dr. Chalk shows him the real ampules have been returned and he is safe to come out

Series 1 — Episode 24
The Deadly Air

by Lester Powell

Production No 3422, VTR unknown
Production completed: September 7 1961. First transmission: December 16 1961.