The DeLorean appeared in Green Hill Zone back in 1991, with Amy, Shadow, Silver, and Doc Brown all stepping out as they looked around.
"Doc, why the hell are we here?" Silver asked as he faced Doc Brown, moving his hands about.
Doc Brown rubbed his chin. "Because my dear anthropomorphic silver colored hedgehog, this is where I sensed the presence of the space time continuum being ripped!" He then placed both of his hands on Silver, shaking him. "We have to stop the source before it consumes everything!"
Amy rubbed her right arm with her left hand as she sighed, her tight jeans puffing up from another loud fart coming out of her big butt. "I wish this would help fix me and my little problem..."
"...Yes, Ms. Rose, we'll get to your gastronomical problem later on." Doc Brown trailed off as he faced Shadow, pointing at him. "Anyway, do you notice anything different around here?"
Shadow squinted as he looked around, finding two Sonics speeding through the Green Hill Zone. "Yeah... there's two fakers going through here!"
"Great Scott!" Doc Brown exclaimed as he placed his hands on his head. "This is worse than I thought! Hurry, we must prevent them from finishing the course!"
"But how?" Silver retorted as he entered the DeLorean again, with Shadow and Amy following him inside. "He's Sonic The Hedgehog! He's too fast for us!"
Doc Brown chuckled as he faced Silver. "Not if we get to the finish line first!" He then slammed his right foot on the pedal as he set the time to fifteen minutes, with the DeLorean disappearing in a bright flash as the two Sonics paused to see what the strange explosion was, looking at each other as they shrugged and kept running.