The Happy Days alum and Childrens Hospital star will co-star in the half-hour comedy pilot that stars Bill Hader as a former Marine who has been trying to pay the bills as a hitman in the Midwest, the network confirmed on Wednesday. Not happy with his life, Hader’s character travels to Los Angeles to off someone and “ends up finding an accepting community in a group of eager hopefuls within the L.A. theater scene.”