"That Great Bill Hill of Hope" -- Jackson and the team make a final attempt to find a cure to the worldwide animal pandemic, but hit an obstacle that may be impenetrable, on the season finale of ZOO, Tuesday, Sept. 15 (9:00-10:00, ET/PT), on the CBS Television Network. Pictured Billy Burke as Mitch Morgan Photo Credit: Best Possible Screen Grab /CBS ÃÂ© 2015 CBS Broadcasting Inc. All Rights Reserved | Episode 1.13 - That Great Bill Hill of Hope | Promotional Episode Photos | Season 1 | Zoo | Gallery