He has maintained a lifelong association with Doctor Who, regularly appearing at conventions and narrating audiobooks to many Target Novelisations of television stories he appeared in, and, from 2009 onwards, reprising his role as Ian Chesterton in audio form for Big Finish Productions. He has continued to do all of this well into his 90s. He even made a cameo appearance as a security guard in the 50th anniversary docudrama An Adventure in Space and Time, in which Russell himself was played by Jamie Glover.
In 2022, at age 97, he returned to the role of Ian Chesterton in televised Doctor Who, in a one-line speaking cameo in the BBC Centenary Special "The Power of the Doctor". At over 57 years, this set as Guinness World Record for the longest gap in between televised appearances as the same character.
His son, Alfred Enoch, is also an actor.
His acting roles include:Film
- The Great Escape (1963) as Sorren
- Superman: The Movie (1978) as the 8th Elder
- The Adventures Of Sir Lancelot (1956-57) as Sir Lancelot
- Doctor Who, 78 episodes / 17 storiesshow list (1963-65, 2022) as Ian Chesterton
- The Black Adder, episode "The Archbishop" (1983) as The Duke of Winchester
- Robin of Sherwood, episode "The Pretender" (1986) as The Duke of Gloucester
- Coronation Street, 47 episodes (1992) as Ted Sullivan
- Casualty, episode "Halfway House" (1995) as Mo Meredrew
- Poirot, episode "After the Funeral" (2005) as Lanscombe
- An Adventure in Space and Time (2013) as Harry
- Big Finish Doctor Who:
- Main Range: "The Game" (2005) — Lord Darzil Carlisle
- Companion Chronicles: 8 releasesshow list (2009-14) — Ian Chesterton
- Short Trips: 4 releasesshow list (2010-11) — Narrator
- The Lost Stories: 4 releasesshow list (2010-13) — Ian Chesterton, Narrator & various other characters
- Special Releases: 2 releasesshow list (2011-13) — Ian Chesterton & the First Doctor
- The Early Adventures: 4 releasesshow list (2014-16) — Ian Chesterton & the First Doctor
- Susan's War: "Sphere of Influence" (2020) — Ian Chesterton