Celebrating 25 years, Howl-O-Scream returns to SeaWorld San Antonio on select dates between September 11 and November 1. 2026 sees a huge revamp in the haunted house line-up with three new offerings: I Know What You Did Last Summer, Witch of the Woods and Deadly Wreckoning. The 25th anniversary haunted celebration also includes new shows, such as Shamu Rocks: Moonlight Mayhem, and new and returning terror-tories.