A possible concise summary is:
The speaker is a host of a show called Film Theory, and he presents his theory that evil Morty from Rick and Morty is actually Rick's original Morty who was abandoned and seeks revenge. He uses evidence from the show and the comics to support his claim, and he also suggests that the current Morty might turn against Rick as well. He then promotes a website called Crunchyroll, where viewers can watch anime shows, including one that is similar to Rick and Morty. He ends with his catchphrase "that's just a theory".
Here are the key facts extracted from the text:
1. The text is a transcript of a video from the YouTube channel Film Theory, where the host analyzes the show Rick and Morty.
2. The main theory discussed in the text is that evil Morty, a character who appeared in one episode of Rick and Morty, is actually the original Morty of the main Rick (Rick C-137).
3. The text provides several pieces of evidence from the show and the comics to support this theory, such as Rick's memories, evil Morty's actions, and Morty's resentment towards Rick.
4. The text also speculates that evil Morty's plan is to turn all the other Morty's against their Rick's, and that our Morty (Earth Morty) might be influenced by him in the future.
5. The text ends with a promotion for Crunchyroll, an anime streaming service, and suggests some shows that Rick and Morty fans might enjoy.