Mark Corden
From Tardis Wiki, the free Doctor Who reference
Mark Corden was a 2nd assistant director for Doctor Who. He also made an uncredited cameo appearance as Omega in The Timeless Children. For the role of Rassilon in the same scene, Corden cast an extra who physically resembled Don Warrington, and is therefore responsible for one of the very rare references to Big Finish in the television series.[1]
Corden as Omega (left), with Tecteun (middle) and an unidentified Don Warrington lookalike as Rassilon (right)
