Crossing Over

We seem to be living in the era of crossover casting.  So while Mr Olivander (John Hurt) has become the next (not-quite?) Doctor Who for the upcoming fiftieth anniversary edition, Sherlock (Benedict Cumberbatch), after putting in a brief performance as Smaug, crops up in the new Star Trek.  Where the first person we see him meet is Mickey (Noel Clarke), one of the Doctor's old companions.  And let's not forget that Spock used to be Sylar while Scotty was Reepicheep and The Editor (a Dr Who villain) amongst many others...