The Harry Potter Star You Didn’t Realize Cameoed in 'Doctor Who'

Though Doctor Who and Harry Potter have as many differences as they do similarities, both are bastions of pop culture that have influenced generations of fans with feverish intensity. Most fandoms have nicknames for their fans, but perhaps none are as ubiquitous as calling one's self a "Whovian" or "Potterhead." Naturally, both being in similar genres means that they see much overlap in their fanbases, but they also have notable crossover with their actors as well.