Ostrich Castle - S1.E44

The Bald Eagles (now transformed into Ostriches after an inept rescue by the Zebra Brothers) still team up with them for revenge against First Squad when the Zebra Brothers say they have a method to change them back into Bald Eagles. The Zebra Brothers pretend to join Big Green so they can get First Squad's alarm system and train the Bald Eagles to come to their aid just like First Squad goes to save Commander ApeTrully when he gets captured.