After Lost’s Man in Black appeared on Grimm, it was only a matter of time before brother Jacob showed up.
TVLine has learned exclusively that Mark Pellegrino, who played the mythological ABC series’ ageless island protector, will guest-star in the upcoming second season of NBC’s darker-side-of-fairy-tales drama.
Grimm’s Season 2 will debut on Monday, August 13 at 10 pm/9c.

http://tvline.com/2012/06/19/grimm-mark-pellegrino/#more-338216