Dom has the latest scoop on CBS' funniest comedy, How I Met Your Mother! John Lithgow's guest appearance as Barney's father hasn't even aired yet (coming up in March!), but the Emmy Award-winning actor is already gearing up for more! His appearance was only supposed to be for one episode, but Lithgow reportedly enjoyed his guest stint so much that he'll be back for yet another episode in May! Could he possibly end up returning as a recurring character? Check out the scoop from Dom in the latest HIMYM TV News below!