We're rapidly entering a few consecutive sections of A-listers. There's more chance of Ser Pounce ending up ruling from the Iron Throne than seeing any of these stars thrown into Westeros, but we can dream, right? Tom Hiddleston is built for a part. I actually think he'd have made a fantastic Viserys back in the days before the Targaryen Prince's head was sloshed with molten gold. Hiddleston would be an enormous and fantastic addition to the cast in almost any role, but given his recent psychotic Loki performances in the Marvel Universe, I'd put him down to play another villain in Westeros. You can never have enough rampant warmongers.