Richard Dawkins
Scientist and thinker Richard Dawkins played himself in the Doctor Who TV story The Stolen Earth.
Dawkins was married for many years to former Doctor Who cast member Lalla Ward (they divorced in 2016). They were introduced by Douglas Adams, a mutual friend, who was a Doctor Who writer and script editor. This is alluded to in the novel The Dying Days where Ward gets a cameo as "Dawkins's wife" at a congregation of noteworthy figures both real and fictional. As documented in Downtime – The Lost Years of Doctor Who, Dawkins was present at Bill Baggs and John Ainsworth's initial casting meeting with Lalla Ward at her home in Oxford for Adventures in a Pocket Universe. As they discussed their plans for the audios, Dawkins made a significant contribution to the series, arguing against naming Ward's character "the Princess" — leading to her being renamed the Mistress instead.
