Nightmare Fuel / Sonic Underground

• The Unwilling Roboticisation aspect from the previous show is carried over to this one & while Robotnik is more conservative with its use here (using it on those who break his laws & oppose his rule), it still is just as terrifying to watch as can be seen this clip where Sleet has a snitcher subjected to the process.
• In episode 3, there's a quick shot of Trevor the mouse being interrogated. He has invasive wires◊ going into him.
• Some of the background Mobians fall deep into the Uncanny Valley.
• In "The Price of Freedom," Robotnik invents watches that watch people.
• The Do-Bot brainwashing people to spill their real feelings about Robotnik. Even creepier is that she isn't aware of what she's doing.
• In “New Echidna In Town”, a Chaos Emerald-fueled Dingo was poised to destroy Mobius. This is scary enough, since it's Dingo turned into a gargantuan, near-formless mass of meat that bellows like thunder about how it wants "Chaos!" Then, Robotnik was willing to let it happen, saying that he didn't care what happened to the world so long as the hedgehogs went with it.
  • Also, Knuckles was manipulated into trusting Robotnik. It’s a good thing he snapped out of it, or else the hedgehogs would have been turned into robots.
• In "Wedding Bell Blues", Robotnik announces his plan to become the official King of Mobius by capturing and marrying Queen Aleena by force, but it turns out that this wedding proposal is nothing more than just a ruse to trap Sonia for his real plan: he will force Sonia to be crowned Princess of Mobius so that he can adopt her as his own daughter, therefore cementing his new role as King. As usual given to her hatred towards Robotnik for overthrowing her mother's reign, Sonia did not take this very well.
  Robotnik If it's my fault you're missing a mother, I will remedy that lack by adopting you, own new crown princess, as my daughter! In fact... you may call me Dad.
  Sonia: AAAAAH!!!
• This show in general. Outside of Queen Aleena having to abandon her children, there are a lot of episodes revolving around Robotnik's empire tearing families apart, leaving children without their parents or leaving parents without their children.
• Also, Manic has been a delinquent since he was a BABY. It’s a good thing he settled on petty crimes like theft. Imagine if he were a terrorist or a murderer...
• The episode where Robotnik sets his sights on the secluded foster home for resistance children, chillingly claiming that once he's done with it, it's going to be changed from "Sanctuary" into "Cemetery." That episode also has the demise of Hip, the robotic baby hedgehog: Hip was a surveillance robot built by Robotnik to trick the SU into finding Sanctuary. Manic had grown fond of Hip, thinking it was a real baby. When a fight led to Hip falling from high in mid-air, Manic tried desperately to save the robot, only to fail as it smashed into the ground, revealing the truth. Until the reveal though, Manic watched helplessly as a baby he cherished died right in front of him. Even worse, there was an indication that Hip had become sentient, as it dreamed of playing drums with Manic. Think about that; between Manic and Hip, who was the more terrified in those final moments? Manic’s crying is certainly understandable.
  • Hip’s design alone is Uncanny Valley, considering he doesn’t really resemble the other hedgehogs.
• One episode has Robotnik shoot Mobians with darts that unfold into transport pods to carry them away and brainwash them.
• In “Six Is A Crowd”, Sonic and his siblings meet their jerky counterparts from a parallel universe. Sonic is a Fat Bastard, Sonia is a spoiled Rich Bitch who treats her servants horribly, and Manic is a greedy tyrant. It’s not until the original power trio shows them the city’s desolate state that the doppelgängers change their cruel ways. But still, seeing Mirror!Sonia go into a rage just for being accidentally poked with a dress pin is scary indeed. Even Sonic is disgusted with his doppelgänger’s grossly obese body.
• Raphi becoming a cyborg in “Who Do You Think You Are”. Imagine if he had been fully roboticized and lost his free will.
• The swollen feet in “Sonic Tonic” are certainly a Fan Disservice and would probably be quite painful. Anyone who has suffered from athlete’s foot or a foot injury would agree.
• In “Beginnings”, Sonic’s foster parents are arrested and their house burns down. Uncle Chuck later rescues Sonic, until the former is arrested and turned into a robot.

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