Guest Stars Jace Norman as Himself Robert Downey Jr. as Himself (Robert Downey, Jr.) Ariana Grande as Herself JoJo Siwa as Herself Dwayne Johnson as Himself Dove Cameron as Herself Chris Evans as Himself Camila Cabello as Herself Riele West Downs as Herself Kristen Bell as Herself Millie Bobby Brown as Herself Caleb McLaughlin as Himself Shawn Mendes as Himself Jules LeBlanc as Herself BTS as Themselves Ellen DeGeneres as Herself Josh Gad as Himself Ella Anderson as Herself Cooper Barnes as Himself Sean Ryan Fox as Himself David Dobrik as Himself Michael D. Cohen as Himself Tom Kenny as Himself Noah Schnapp as Himself Finn Wolfhard as Himself Simon Cowell as Himself Sadie Sink as Herself Bill Fagerbakke as Himself LeBron James as Himself Alia Shelesh as Herself Jeremy Renner as Himself Chris Hemsworth as Himself Billie Eilish as Herself Asher Angel as Himself (Performer) Scarlett Johansson as Herself Mark Ruffalo as Himself Lil Nas X as Himself Christina Koch as Herself