Keel receives a 'phone call from one of his patients, and ends up assuming the identity of her missing husband, a scientist engaged in secret research. Shot in the chest, Keel needs a minor operation - but the anaesthetist has tampered with the oxygen.
| Creator | Sydney Newman |
|---|---|
| Actor | Patrick Macnee, Linda Thorson, William Lucas |
| Country | United Kingdom |
| Production | Associated British Picture Corporation |