StarKid started strong in 2009 with A Very Potter Musical and has remained consistently great for 15 years while getting even more polished.
This show stands on its own and is constantly enjoyable, but the more of StarKid's prior Hatchetfield content you've watched, the better this show is. There are running gags, recurring characters, in-jokes, and an entire lore surrounding all the weird stuff that happens in Hatchetfield.
And all their stuff is freely available on their YT channel.
If you are considering checking out this movie, you might want to consider watching The Guy Who Didn't Like Musicals first.
This show stands on its own and is constantly enjoyable, but the more of StarKid's prior Hatchetfield content you've watched, the better this show is. There are running gags, recurring characters, in-jokes, and an entire lore surrounding all the weird stuff that happens in Hatchetfield.
And all their stuff is freely available on their YT channel.
If you are considering checking out this movie, you might want to consider watching The Guy Who Didn't Like Musicals first.