So, what could a movie do with everything wrapped up? Well, there is one plot thread that was setup in the show but has yet to be resolved and that is the hate of Queen Angella, Glimmer's mom. It was made clear that Angella wasn't killed but rather trapped in another dimension in order to stop reality from going down the crapper. This was a MAJOR moment in the series with it being what resulted in Adora giving up on saving Catra from herself, that re-enforced Adora's martyr complex and set Glimmer on her path for self-destruction that almost destroyed all of Etheria.
This is the one plot point left unresolved that has left an notable impact on the 3 of the 4 leads and with the right handling it could make for a great movie! So, that would be what I would want, a story where Adora and the others have found a way to bring Angella back but this draws the attention of a new villain who seeks to fill the power vacuum left in the wake of Horde Prime's return who sees uses this power to become as powerful as She-Ra so if they succeeds not only will the heroes fail to save Angella but a new threat will emerge to threaten the galaxy.
The story is one that has a personal stake for the heroes as this would fully solidify Catra's redemption and re-enforce Adora's self worth and allow Glimmer to have both her parents back while presenting a threat that can threaten the galaxy by being a twisted inversion of She-Ra. This ultimately results in a two on one fight with Adora and Catra battling the film's villain.
I love the finale of the series but I do want to see She-Ra and Catra as a Battle Couple against an opponent that they can only defeat by them working together with a little help from their friends. Throw in a bigger budget for more fluid animation, a good script with a solid beginning, middle and end and this could be AMAZING!!!
