There were tons of decepticons who betrayed Megatron. Starscream betrayed Megatron many times to become leader of the deceptions on most transformers media. In transformers G1 Astrotrain and Blitzwing betrayed Megatron and tried to become the new leaders of decepticons in one of the episodes. Shrapnel, Bombshell and Kickback the insecticons betrayed Megatron and tired to become the new leaders of the decepticons in one of the episodes of transformers g1. Devastator and Bruticus had a malfunction where they betrayed Megatron and tried to destroy everything. Scourge tried to betray Megatron and take over the decepticons and Predacons himself in Transformers Robots In Disguise. Thrust and Sideways betrayed Megatron and revived Unicron to destroy everything in Transformers Armada. In transformers energon Scorponok betrayed Megatron to save Alpha Q’s planet acting as mole until Megatron brainwashed Scorponok. Shockblast betrayed Megatron and tried to kill everyone after being possessed by unicorn. Six Shot betrayed Megatron and tried to kill him but ended up getting killed by Megatron when he was in Galvatron form. In transformers G1 comics Shockwave and Predaking betrayed Megatron when Shockwave wanted to lead the decepticons and ordered Predaking to kill Megatron.
It might've been helpful if you sorted that out better. For example: G1 Marvel Comics: Starscream Shockwave Soundwave (UK comics where he joined hands with Starscream to kick out both Shockwave and Megatron to become joint leaders) G1 Cartoon: Starscream Astrotrain and Blitzwing (Triple Takeover) The Insecticons (The Insecticon Syndrome) Armada: Thrust and Sideways Movie: Starscream (?) (depending on whether you agree with the theory Starscream joined in with the jets that attacked Megatron in the first film)
Welcome to the site! Also, please use paragraphs so it's easier to read. Did Overlord betray Megatron? I swore that he did, but I'm having a hard time remembering.
I've always believed if you split Megatron in half, you'd get Walter White ( malignant narcissist, shades of a true terrorist, creates non stop chaos) and Jesse Pinkman ( just has no luck whatsoever, destined to suffer/remain in toxic co-dependent relationships) I want to be fair about this. Once Die Hard came out and was a huge hit, and people really could see the amazing performance by Alan Rickman as Hans Gruber, that's when "big bad villains" took a huge change in direction overall. Instead of just one dimensional heavies, they became much more nuanced, had true character arcs and were extremely charismatic. The constant betrayals served the episodic nature of the cartoon and some of the comics. It left the characters into a very one dimensional setting and behavioral model. But had Transformers G1 been made AFTER Die Hard, I think Megatron's conception would have been far different.
Descriptions on some of these seem to be a bit off actually, they weren’t trying to take over the decepticons I think you’re mixing up a few different episodes with different plots because something like that didn’t exactly happen Shockwave didn’t do that because he wanted to be leader, he had already given up on that in earlier issues, actually Shockwave did that because Megatron had gone insane after the death of Optimus prime
