Sonic theories are always fun to discuss, but sometimes it's interesting to think about some of the darker theories that could potentially exist, regardless of the canon.
One that my boyfriend and I like discussing is one involving Knuckles. I'm sure most of us have played through Sonic 3 and Knuckles, but to give an overview, remember the scene where Robotnik electrocutes Knuckles when he attempts to get the Master emerald back from him? We've thought of some interesting theories regarding that.
One is that Knuckles got some kind of implants in his brain that allowed Robotnik/Eggman to control him in later games, and why he still continues to fall for the same tricks and constantly gets duped. In Sonic 3, we hardly see the foolish naive echidna that is later portrayed in many of the later games (not a big fan of Knuckles being a complete doofis, though I'll admit to liking Sonic Boom the cartoon series but I digress). In Sonic Adventure, Knuckles is duped by Robotnik once more and he attacks Sonic. In Sonic Advance 2 Knuckles attacks Sonic while controlling one of Eggman's machines.
Another possibility is that Knuckles is completely brainwashed, reliving the same nightmare over and over as Eggrobo attacks Angel Island. This could be where the Knuckles gameplay levels come in, since I've always figured they took place after the Sonic ones.
Even darker? Knuckles dies after Sonic 3 and Knuckles and is replaced with a clone or robot duplicate that's under Eggman/Robotnik's control.
Don't get me wrong, I love Knuckles and he's always been one of my favorite characters. I just think it's fun to speculate certain theories about him. Even if he wasn't killed per say (that was certainly a powerful electrical jolt that he got from Robotnik, and he might have helped Sonic in a last ditch effort to save the Master Emerald when he finds out who the real badguy is) I think the mind control is possible, as well as the clones or robots. Knuckles makes a lot of appearances in later games, but why exactly does he leave Angel Island? Isn't that his sworn duty? Unless it's a clone duplicate to trick Sonic and Tails.
What do you think of these darker theories about Knuckles?
Do you have any dark theories about Sonic?
I already talked about how I think Tails is a kitsune or at least part kitsune in another thread, but I don't think he's necessarily evil. Unless the entire best friend thing is an act to learn Sonic's weaknesses and ultimately plan his demise. Foxes are tricksters after all, haha!