Martha (HISHE)

Martha is a major antagonist in the web series How It Should Have Ended. He was mentioned in How Guardians of the Galaxy Vol. 2 Should Have Ended, before appearing as the overarching antagonist of HISHE's parodies of Wonder Woman & Thor: Ragnarok, and the main antagonist of How Justice League Should Have Ended. He is a Sovereign created by Ayesha. He is voiced by James from TheOdd1sOut.

Guardians of the Galaxy Vol. 2
He didn't make an appearance, but he was mentioned by Ayesha when she looks onto her newest genetic creation, claiming he will be the perfect key to take down the guardians.

Wonder Woman
In a post credit scene, we see Martha officially make it to Earth. He just stands there and takes out a photo of Batman and Superman in the cafe, and starts searching for them.

Spider-Man: Homecoming
Martha does not make an appearance, but we see a drawing of him when Michelle sketches Batman in the cafe.

Thor: Ragnarok
Martha appears in the crowd of girls at the cafe window, as he finally located Batman and Superman. He did not attack because Thor wasn't the reason why Martha hates the cafe.

Justice League
After Steppenwolf's death, Martha shows up and destroys the cafe. The Justice League huddles up and Batman tells them what to do to stop Martha, and after the huddle, Superman snaps Martha's neck, killing him once and for all.

Trivia

 * Martha parodies Adam Warlock