- Charli XCX as Stephanie
- Russell Brand as George Jacqueline/Bash
- Sabrina Carpenter as Alena McBride
- McKenna Grace as Adalyne McBride
- Kristin Scott Thomas as Eleanor Jacqueline
- Kevin Michael Richardson as Craig
- Ewan McGregor as Sponghuck
- Dee Bradley Baker as Tyler
- Linda Cardellini as Josie
- Jonny Greenwood as Cole
- Prince Royce as Brent
- The special isn't officially part of the Weird World or Summer with the Royals franchises.
- This was originally planned to be a full-length movie, but the idea was scrapped.
- Stephanie is the main protagonist of the special, with George being the deuteragonist.
- This marks the first time ever in the Weird World franchise where Stephanie's the protagonist.