At the end of a long adventure, Sonic goes to the shores of Never Lake for the once-a-year appearance of Little Planet - a mysterious world where it is said that the past, present, and future collide through the power of the Time Stones hidden within it.
Doctor Robotnik, Sonic's nemesis, has chained the planet down and cast it in a metallic shell, hoping to get the Time Stones all to himself, and with that power he'll be able to twist time itself!
Fight through the past, recover the future, and defeat the evil Metal Sonic to save the future from Doctor Eggman's nefarious schemes!
Sonic was fast asleep until one day Numbuh 1 of the kids next door manages to bring him into their wworld as a evil robot has enslave the kids entirely including his teammates and so now Numbuh 1 and Sonic must stop this evil robot and save the kids next door, however in the progress of bringing Sonic here the hedgehog finds himself in his younger body