Zap2it has confirmed that Kevin McNally will play the old "friend" of Bobby's, who helps the Winchesters out of a jam... reluctantly.
For right now, Frank is only set to appear in one episode, but as
part of the hunters' network, there's always a possibility for a return.
Hopefully, Frank fares better than the last genius who got caught in
the Winchester web -- may Ash (Chad Lindberg) rest in peace.
The episode will also feature recurring "Supernatural" character Sheriff Jody Mills, a friend of Bobby's played by Kim Rhodes.