Christmas gets weird - really weird - after George and Harold go back in time to change up a few of their beloved holiday's traditions.
Unfortunately the movie Captain Underpants: Mega Blissmas is not yet available on HBO Max.
| Writing | Dav Pilkey | Novel |
| Writing | Matt Smith | Writer |
| Writing | Mark Banker | Writer |
| Directing | Erik Kling | Director |
| Directing | Kevin Peaty | Director |
| Production | Todd Grimes | Supervising Producer |
| Production | Peter Hastings | Executive Producer |
| Production | Ania O'Hare | Casting |
| Production | Cymbre Walk | Casting |
| Production | David Wiebe | Executive In Charge Of Production |
