Quest for the Chaos Emeralds is the title of a four part saga in the series Adventures of Sonic the Hedgehog. The main concept of this saga is that Dr. Robotnik travels through time to find the four Chaos Emeralds which he will use to conquer the universe. Sonic and Tails with the help of Professor Caninestein must chase Robotnik through time and space and stop him from getting the Chaos Emeralds and save the universe.
This saga spans through four consecutive episodes.
- "Black Bot the Pirate"
- "Hedgehog of the "Hound" Table"
- "Robotnik's Pyramid Scheme"
- "Prehistoric Sonic"
Robotnik forced a scientist, Professor Caninestein, to build him a time machine to grab the Emeralds and become Supreme High Robotnik (possibly Robotnik's super form). In this form, he could rule the universe. Unfortunately for him, the scientist granted Sonic and Tails the duty of making sure he does not get them. Assisted by Caninestein's various time-travel devices (sneakers, surfboard, skateboard) and the locals from each time area (some were parodies of real historical figures or even Sonic's own ancestors) Sonic and Tails foiled Robotnik's first attempts at the first three Emeralds, facing many life-threatening situations on the way.
But Robotnik tried again and succeeded, using all four emeralds to transform into a form he dubbed "Supreme High Robotnik". Supreme High Robotnik almost killed the duo by sending them into the Big Bang (represented by a giant stick of dynamite which would bring the universe forth once it explodes), but they managed to escape, and Sonic formed an idea. Completely ignoring the rules of paradox, the duo managed to gather their past selves (who, as keen-eyed viewers will notice, are all shown using the skateboard instead of the devices they used previously) after they left each time area. Five Sonics and five Tailses went back to the present time where Supreme High Robotnik was still wreaking havoc. The team that now consisted of ten all worked together to steal back the Emeralds and return them to their original places.