User blog comment:Mouseinphilly/Crossing Over: What Would You Like To See?/@comment-3477287-20130730083848

Gravity Falls and Fish Hooks are the first to come to mind. Lilo & Stitch did crossovers with Kim Possible, The Proud Family, Recess, and American Dragon so I'm hoping Phineas and Ferb gets the same treatment. Heck, even a crossover with originals like Mickey, Donald, and Goofy would do.