[1] Cudmore's first major role came in 2003 when he appeared as Piotr Rasputin in the second installment of the X-Men film franchise, X2.

On July 11, 2012, it was confirmed that Cudmore would portray Master Chief Petty Officer John-117 in the live-action Halo 4: Forward Unto Dawn web series.

[3] Cudmore reprised the role of Colossus in X-Men: Days of Future Past, in which he reteamed with Twilight co-star Booboo Stewart.

[7] He was initially announced to reprise his role in Dark Phoenix (2019), though his part was ultimately deleted.

Cudmore's older brother, Jamie, is a member of the Canadian Rugby World Cup team.