War of the Hecks is the eleventh episode of Season 5. It aired on January 15, 2014.
The ultimate prank battle is on between brother and sister when Sue discovers that Axl stole Orson High's Thundering Hens mascot head over a year ago, forcing Sue to wear an embarrassing bear head in her role as the school mascot. A friendless Dr. Goodwin tries to make friends with a reluctant Frankie, and invites her to accompany him to multiple after-work social gatherings. Meanwhile, Frankie is forced to give up Colin Firth just as Mike is finally starting to bond with it.