Liv undergoes vocal surgery and is unsure if she’ll ever be able to sing again, so Karen and Maddie call in reinforcements to help. Meanwhile, Parker and Val are surprised by their competition in the Mars Madness finals.
- Dove Cameron as Liv and Maddie Rooney
- Joey Bragg as Joey Rooney
- Tenzing Norgay Trainor as Parker Rooney
- Kali Rocha as Karen Rooney
- Lauren Lindsey Donzis as Ruby (absent)
- Jessica Marie Garcia as Willow Cruz
- Shelby Wulfert as Maddie 2
- Emmy Buckner as Liv 2
- Chloe East as Val Wishart
- Jordan Fisher as Holden Dippledorf
- Victoria Moroles as Andie Bustamante
- Jimmy Bellinger as Artie Smalls
- Carter Hastings as Evan
- Laura Bell Bundy as Tracey Okahatchee
- Ego Nwodim as Ms. Karsch
- This is the first appearance of The Dream in the fourth season.
- Holden Dippledorf made his first appearance in season 4 and the last because he will not be in the series finale End-A-Rooney, according to that episode's table read.
- This is Part 2 of the 3-part series finale of Liv and Maddie: Cali Style.
- Evan made his first appearance in Season 4.
- Artie Smalls made his second and last appearance in Season 4.
- This episode is focus on Liv's voice, her dream to go to Broadway.
- This episode is similar to Muffler-A-Rooney, where Maddie was nervous if she will be able to play basketball again after surgery.
- Liv sings Key of Life again in this episode.
- Liv and Holden still appear to like each other.
- This is the second (and final) episode to feature live play during the episode, the other was Choose-A-Rooney.
| To view the Voice-A-Rooney gallery, click here.