Apirant's Disclaimer: I do not own anyone or anything. This is a fan fiction, all based on one simple idea: What would happen if Robotnik trapped Sonic? I know, the title sucks. (Edited everything below the first two paragraphs)
Shuffling through the heavy explosions on one of the aircrafts of his fleet, a way too familiar blur continues to speed out of sight of one monitor into another. Robotnik sat in his very comfortable chair as he watches the many screens of his computer, watching Sonic fly into the death traps that he carefully laid out. Instead of slamming his hands into the keyboard out of the constant frustration and regret of the mechanical layout, he simply stroked the large mustache, grinning for some odd reason.
Those spikes? He leaped over them. The human-impossible loop? He sped through them and still managed to control his speed to dodge the next obstacle. That endless pit? There's nothing that Triangle Jump can't fix. You'd think someone as reckless and confident as Sonic would eventually fall for one of these traps, but no, he's used to it. Is he ever cautious? Probably, but he's always too fast for you to notice.
In the end is where it all really matters. A man with an IQ of 300 should easily predict a primitive animal's every move, especially when he had a chance to examine it from previous experiences, and too much time to prepare.
Speaking of the devil, here he comes. Barging through the wall with the troublesome spin dash, the blue hedgehog takes a cocky stance. "All right, Eggman! What do you got planned for me this time?" His taunting voice, his unbelievable confidence, and that smug grin on his face... It's the reason why no one could stand to be taunted by someone like him, let alone lose to him.
"I'll let Metal Sonic take care of you!" Stepping right behind Sonic was a mirroring silhouette. Yes... Metal Sonic is probably the worst possible outcome if Sonic lost. His limbs dismembered and replaced by the cold steel, his heart engulfed with machinery, and his immortal duty dedicated to serve under Robotnik. There is nothing worse. Having a visual image of his nightmare stand before him must have been nerve-wracking.
Jamming his finger onto the red button, impenetrable bars slam around the two. "So, a cage fight is it? Bring it on!"
"Metal Sonic! You know what to do! Don't disappoint me!" Yes... Steal the seven Chaos Emeralds and get rid of them immediately. After that, what could Sonic do?
What could Sonic do if he comes to a dead end and cannot run back? With a single Chaos Emerald, Sonic would distort space and warp out of there. Without it, fox boy and the rest of his friends would save him. That was Robotnik's next step. Destroy all those who oppose him.