Liv convinces Joey to let her join his Brain Olympics team, even though he doesn't think she's smart enough – and she's set on proving him wrong. Meanwhile, Maddie holds a yard sale to raise funds for the French Club's trip to Montreal, and a priceless childhood memory accidentally gets sold.
- Dove Cameron as Liv and Maddie Rooney
- Joey Bragg as Joey Rooney
- Benjamin King as Pete Rooney
- Kali Rocha as Karen Rooney
- Tenzing Norgay Trainor as Parker Rooney
- This is the first time that a main character is absent.
- It is revealed that Liv portrayed Stephanie Einstein in Sing it Loud!