6 Season
161 Episode
The Avengers - Season 1 Episode 3 Square Root of Evil (1969)
Steed impersonates Riordan, a forger soon to be released from prison, and gains the trust of gang-leader Hooper. Things seem to be going well until Hooper's second-in-command, known as the Cardinal, announces that Riordan's girlfriend is outside waiting to see him.
- Country : United Kingdom
- Genre : Action & Adventure, Crime, Sci-Fi & Fantasy
- Studio : ITV1
- Director : Sydney Newman
- Cast : Patrick Macnee, Linda Thorson
