Quest for the Chaos Emeralds

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 take over 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.

Episodes
This saga spans through four consecutive episodes.
 * 1) "Blackbot the Pirate"
 * 2) "Hedgehog of the Hound Table"
 * 3) "Robotnik's Pyramid Scheme"
 * 4) "Prehistoric Sonic"

Chaos Emeralds

 * Invisibility: This made the holder invisible, and at first seems to be invisible itself. However, the invisibility can be negated if the holder is covered in substances such as sand or flour. Buried on an island in the time of pirates.
 * Invincibility: This granted invincibility, but it is more complicated than simply holding it. To trigger its powers permanently, its first holder must become king. As its title suggests, the holder becomes completely immune to physical harm, as well as becoming quite muscular and gaining superhuman strength. Interestingly enough, Tails is able to access its power despite not being king. Guarded by Merlynx the Magician in the Middle Ages.
 * Immortality: This granted immortality to the holder. This is not simply an inability to die of old age or natural causes; any injuries that the holder suffers immediately heal within seconds to minutes; in a way, this eliminates the need for the Emerald of Invincibility. Resided with Robotnikhotep, Robotnik's mummified ancestor, in a Mobius parallel of Ancient Egypt.
 * The Power of Life: The most powerful of the four, this emerald can give or take life from anyone and anything, even if they're already dead. This was hidden on an island, guarded by a volcano entity who would only yield the emerald after a sacrifice was offered.

Main Cast

 * Sonic the Hedgehog
 * Tails
 * Dr. Robotnik
 * Professor Caninestein
 * Scratch
 * Grounder

Minor Cast

 * Blackbot the Pirate
 * King Arfur
 * Merlynx
 * Masonic
 * Penelope
 * Robotnikhotep

Plot
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 Tails 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.