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Megatron ate people multiple times
(Sources: Generations Selects Special, Fight! Super Robot Lifeform Transformers: The Battlestars, Transformers vs. GI Joe)
I don't even really know where to start talking about this. Can we agree that this is insane? Like just the whole idea that it is CANON in MULTIPLE COMICS that Megatron enjoys eating humans. I don't know. I think this should show up in more of the mainstream Transformers fiction I think "Megatron eats people" should be a defining aspect of his character. I can't go into more detail about this I plead the fifth.
Honorable mention: the episode "Microbots" from G1 in which the Autobots shrink down and go inside his body.
Extreme amounts of robot hypno in G1
There are just a lot of episode plotlines in G1 where characters are mind controlled or have their memories altered. Usually it's Megatron doing it but sometimes it's the Insecticons doing it. I don't have like a comprehensive list of the times that this happened but:
- Megatron altered Bumblebee's memories to make him give misinformation about where the Decepticon base was and he used a weird probe thing extending from his chest to Bee's head to do it
- All the various times the Insecticons used their mind control gimmick
- Characters getting "reprogrammed" as if they're regular robots because the whole thing about them being metal-based organisms hadn't really been established yet
- The Decepticons captured Skyfire and Megatron wanted to "rewire his logic circuits" to make him one of them
- Megatron mind controlled an intelligent supercomputer to make it do his bidding
- Megatron apparently made a bunch of the Transformers on Cybertron ally with the Decepticons before the war by permanently altering their minds with some device called a "Robosmasher" and this is why the Constructicons are bad guys (the robosmasher additionally has a bunch of robot tentacles that it grabs people with in order to mind control them), the flashback clip in which this happens shows a freshly mind controlled Transformer saying "instruct me, Megatron, I exist only to serve you, I will obey your every order"
- Honorable mention: there was also an episode in which Soundwave took over a nightclub and used music to mind control a bunch of humans
Megatron took over a city and subjugated all the humans
The plot of the 2 part G1 episode "Megatron's Master Plan" is that Megatron gets jealous seeing the Autobots get an "Autobot Day" parade so he convinces a rich guy who wants to be mayor that the Decepticons are actually the good guys and he should frame the Autobots for crimes to get them kicked off the planet, and then once they do get kicked off the planet (and after the Decepticons have their own parade) Megatron captures and enslaves all the humans in the city, puts handcuffs on them, orders them to labor for him producing energon from all possible energy sources, and renames the city "Megatronia 1". He also shoves the guy he manipulated to the ground and orders him to "grovel for his amusement". I don't know if I'm really getting across how insane this was to watch and how the atmosphere of it was so please just go watch it. It reminds me a lot of All Hail Megatron except they enslave the humans instead of just blowing everything up.