Guest Stars Jace Norman as Himself Robert Downey Jr. as Himself (Robert Downey, Jr.) Ariana Grande as Herself JoJo Siwa as Herself Dove Cameron as Herself Dwayne Johnson as Himself 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 BTS as Themselves Ellen DeGeneres as Herself Josh Gad as Himself Jules LeBlanc as Herself 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 Simon Cowell as Himself Finn Wolfhard as Himself Sadie Sink as Herself Noah Schnapp as Himself Bill Fagerbakke as Himself LeBron James as Himself Alia Shelesh as Herself Jeremy Renner as Himself Mark Ruffalo as Himself Billie Eilish as Herself Chris Hemsworth as Himself Scarlett Johansson as Herself Asher Angel as Himself (Performer) Lil Nas X as Himself Christina Koch as Herself