Here is the article from The Post Chronicle;
Doctor Who star David Tennant wants to play a "freakish" villain in his next Tv role. The Scottish actor, 36, admits he loved watching the original Batman series - and would relish the opportunity to torment the Caped Crusader himself.He says,
"I'd love to play the Riddler and be bad to Batman. It was so much fun to watch. I thought the Riddler was one of the most freakish of the villains, especially with that wild laugh."
It would be a big change from the character of The Doctor but I think David would make an excellent Batman baddie. He was great at being evil in Harry Potter The Goblet Of Fire playing Barty Crouch Junior.
to be honest, i'd love to see David in this role...
i think he's got the look and the 'intelligence' to pull it off, we know he's a damn good actor and he can definitely do manic, so i think he'd be the perfect cast for The Riddler...