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Disney XD’s animated comedy “Milo Murphy’s Law” is planning a crossover episode next year with “Phineas and Ferb,” the hit comedy from the same creative team that ran from 2007 to 2015.

As a teaser, the Season 1 finale of “Milo,” to air Sept. 30, features a visit from a beloved, if slightly villainous, character from “Phineas and Ferb,” the volatile head of Evil Incorporated, Dr. Doofenshmirtz.

Creators Dan Povenmire and Jeff “Swampy” Marsh have planned on doing a crossover since the beginning of “Milo Murphy’s Law” and have been planting Easter eggs throughout the first season hinting at the fact that Milo and friends live in Danville, just a few neighborhoods away from the setting of “Phineas and Ferb.” In addition to Phineas and Ferb and Doofenshmirtz, other characters confirmed to appear include Perry the Platypus, Candace, Isabella, Baljeet, and Buford.

In the episode “Fungus Among Us,” Milo, Cavendish, and Dakota travel back to 1965 and inspire the creation of Dr. Zone, only to encounter a sinister plot to take over the world. Back in the present, Zack and Melissa find that everyone they know is behaving very strangely and uncover a dangerous threat springing up among them.

Here’s clip from the finale: