Finn offers to care for Lou's beloved cow Bessie but must prove he can handle the responsibility. Meanwhile, Destiny and Gwen concoct a plan to patch things up between Ava and her mother, and Matteo helps Noah learn French for an audition.
- Miranda May as Lou Hockhauser
- Mallory James Mahoney as Destiny Baker
- Raphael Alejandro as Matteo Silva
- Will Buie Jr. as Finn Sawyer
- Shelby Simmons as Ava King
- Scarlett Estevez as Gwen Flores
- Israel Johnson as Noah Lambert
- The title is a play of the phrase "an utter disaster".
- Gwen's favorite doll was a Wood Nymph Dream Effigy named "Cuddles".
- Because of his bond with Bessie, Finn decides to become a vegetarian.
- Destiny uses stationery with glitter.
- Lou jokes that Bessie arrived via "Moo-PS".
- Ava's mother, Bonnie King, is introduced.
- Bonnie King states she is the mother of six children.
- Ava's favorite dish her mom makes is Canadian Bacon Burrito Casserole.
- Ava's middle name is revealed as Marie.
- Finn likes machines that shoot out balls.
- The cow that appeared in the episode is named Ashley.
The image gallery for An Udder Disaster may be viewed here.