Chris Elliott will guest-star in multiple episodes of Fox’s post-apocalyptic comedy as Glenn, a castaway living on a deserted island, EW has learned exclusively. Phil (Will Forte) and his fellow survivors come in contact with Glenn presumably as they take to the sea and make their way south to escape the failing nuclear plants in the U.S. The Schitt’s Creek star (who also headlined the sea-based cult comedy Cabin Boy) will make his first appearance on Last Man in the second episode of season 4.Meanwhile, Kristen Wiig, who appeared twice in season 3 as socialite-turned-crazy-bunker-lady Pamela, will be back in at least three episodes, including the premiere. She was last seen in the final scene of the season 3 finale, killing Pat (Mark Boone Junior) as he prepared to shoot Phil, and that’s where the action will pick up in the season 4 premiere.