Hey guys, it's me, the Invader Teen14 and I have a crazy cartoon/video game conspiracy theory for two famous franchises and this one may surprise each of you.
My theory is that Sonic the hedgehog and Monster High share the same universe.
I know what you're thinking, how is it even possible? Well there are a few good reasons.
1. All the monsters like Werewolves, werecats, sea monsters, lake monsters, gargoyles, flying monsters etc. are all anthropomorphic creatures and monsters can speak like humans, like the Mobians.
2. Monsters have built cities and have leaders, like the Mobians.
3. Monsters have built advance technology like Icoffins, cars, laptops, etc. Like the Mobians.
4. Monsters have emotions and can think for themselves and they can have families.
5. Monster High is set in a post-apocalyptic future.
The last one may seem confusing but give yourself a minute to think about it, there is a small town of humans and we don't even see other landmarks, it is possible that the planet is Mobius because there are more forest than cities but we do see landmarks such as New Goreleans, Scaris, etc. It is possible that these cities are rebuilt versions of the old cities after the Xorda bombing (Archie comics), the monsters are possibly either from the aftermath of the Xorda bombing or the result of an experiment from the echidna race.
Plus, the deadly six are also monsters so it's incredibly possible that Frankie and her friends exist on the planet Mobius.
Also, Eggman has tried to use monsters and/or ancient spirits a few times (Dark Gaia) and that dragons are also monsters and they exist on Mobius, which gives even more support for this theory.
The planet Mobius is full of countless creatures (human, Mobian, monster, etc.) and there's only more mysteries to what the planet holds.
Plus it would be really cool to see Eggman get his butt kicked by Super Sonic and Super Frankie.