To repay a debt to Millie (voice of guest star Molly Shannon), a very reluctant Louise (Kristen Schaal) must attend the Pixie Princess Promenade in the Season 12 premiere "Manic Pixie Crap Show." Meanwhile, a bouquet shaped like a dog forces Linda (voice of John Roberts) to confront a painful chapter from her past. H. Jon Benjamin, Dan Mintz, Eugene Mirman and Larry Murphy also are heard in the voice cast.