Shawn Mendes as Lyle (voice)

Winslow Fegley as Josh Primm

Javier Bardem as Hector P. Valenti

Constance Wu as Katie Primm

Scoot McNairy as Joseph Primm

Brett Gelman as Alistair Grumps

Ego Nwodim as Carol

Lyric Hurd as Trudy

Jason Kravits as Cy

Ben Palacios as Lyle's Motion Capture

Joshua Vasquez as 8th Grade Boy

Marc Farley as Animal Store Owner

Sal Viscuso as Judge

Adam Murray as Lowlife

Mary Neely as Security Technician Mary

Don DiPetta as Paramedic

Lindsey Moser as Wrestling Coach

Matthew Risch as Walkie Talkie Police Officer

Clayton English as Young Security Guard

Mac Wells as Show Security Guard

Jef Holbrook as Audition Stage Manager

Matthew Wilkas as Night Construction Worker

Lauren Boyd as Live Show Stage Manager

Reif Howey as Sweep Dancer

Evangeline Miller as Sweep Dancer

Jene Moore as Sweep Dancer

Chance Mizell as Sweep Dancer

Christine Moon as Zookeeper

Angela Davis as HOA Member

Kathy Orlando as HOA Member

Caden Brillantes as Wrestling Student

Kyson Galligan as Wrestling Student

Alton Williams as Wrestling Student

Thomas Williams as Wrestling Student

Irving Thigpen as Wrestling Student

Matt Rogers as Show Host

Eric Rutherford as Esteemed Judge

Eboni Nichols as Show Judge

Taylor James as Judge

Donnie Cormier as Security Guard #3

Rick Pearson as Live Show Producer

Al Thompson as Animal Control Officer

Keiko Bell as Court Spectator (uncredited)