Introduced in the first episode of Series 11, Ryan was a companion of Jodie Whittaker's Thirteenth Doctor until the 2021 New Year's Special "Revolution of the Daleks".

Though his symptoms are relatively mild and high-functioning, it affects his sense of balance to the point that he finds tasks like riding a bicycle extremely difficult.

In September 2018, three Series 11 tie-in novels were announced, all of which feature Ryan Sinclair – The Good Doctor, Molten Heart and Combat Magicks.

[2] On 22 October 2017, it was announced that Cole had been cast as a companion in the eleventh series of Doctor Who, and would appear alongside Jodie Whittaker in 2018.

Showrunner Chris Chibnall explained: “It's a relatively common thing among kids, so I think it's important to see that heroes come in all shapes and sizes.” Considerable research was undertaken with the Dyspraxia Foundation to ensure an accurate portrayal of the condition.