The Vampire Bunny Slayers present Dr. Horrible's Sing-Aong Blog, wherein the gently evil Dr. Horrible plans to take over the world using his diabolical Freeze Ray. Will the arrogant Captain Hammer save the day? Find out at a one-night-only event at 8 p.m., Saturday, June 25. $5; free child younger than 7. All proceeds benefit the park. Call or visit tucsonvalleyofthemoon.com for more information.