Phineas and Ferb try to attend the Tri-State area's annual sci-fi/fantasy convention to meet their hero, Clive Addison, a special effects guru. But their plans go awry when they're stuck in the middle of a duel between fantasy fans and sci-fi geeks. Meanwhile, Candace tries to keep the fact that she's a big fan of Ducky Momo, another convention staple, a secret. Across the convention hall, Dr. Doofenshmirtz has taken Jeff McGarland, a television executive hostage, so he pitch a new TV show titled Doof 'N Puss, starring himself and Perry.