Phineas and Ferb 2:Balloony Strikes Back

Phineas and Ferb are at Isabella's house for a pool party when something lands in Phineas and Ferb's backyard. The trio goes to check it out. They see a balloon in a war suit get out of a space ship. They think it is harmless,so they walk up to it. It swats them away and moves on. Balloony goes to Doofenshimrtz Evil Incorporated and beats up Perry and Dr.Doofenshimrtz. Everyone has to team up to defeat Balloony!