Joey is invited to perform stand-up at the hottest comedy club in Los Angeles by his idol comedian Jim Breuer. Meanwhile, Parker enlists Liv and Maddie to help him with a science experiment.
- Dove Cameron as Liv and Maddie Rooney
- Joey Bragg as Joey Rooney
- Tenzing Norgay Trainor as Parker Rooney
- Lauren Lindsey Donzis as Ruby
- Jim Breuer as himself.
- Mitch Rouse as Mickey
- Allegra Barnett as Jackie
- It was originally called Celebrate-A-Rooney.
- It was the penultimate episode filmed of the series.
- Stand-up comedian and actor Jim Breuer guest stars in this episode as himself.
- Jessica Marie Garcia's fiancé', Adam Celorier, guest stars in this episode.
- Lucas Adams and Shak Ghacha are both tagged in this tweet for the episode, although its unlikely Josh and Dump Truck appear.
- This was the third episode in a row and overall of Season 4 to have a main cast member absent. The previous episodes, Ex-A-Rooney and Tiny House-A-Rooney, new main cast member, Ruby, was absent. This episode, Karen Rooney was absent.
| To view the Big Break-A-Rooney gallery, click here.