It's hard to imagine a more ideal casting scenario than this.

Sources confirm to E! News that Leonard Nimoy will portray William Bell on the season finale of Fringe.

As viewers know, the character is the much-discussed - but heretofore unseen - Massive Dynamic mogul. He and Walter Bishop were mad-scientist pals back in the day.

On the episode, Nimoy is expected to set up a recurring role for season two.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.