One of the few constants on
Doctor Who is change. Companions come and go. Even the Doctor herself is not guaranteed to look the same from one season to the next. Such is the cycle of life in the TARDIS.
Therefore, few fans were likely surprised by the news that stars Bradley Walsh and Tosin Cole, who play Graham O’Brien and Ryan Sinclair respectively, would depart following holiday special “Revolution of the Daleks.” After all, the show itself hints that Ryan, at least, is more than ready to return to his real life during the final few episodes of season 12.