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Worlds Collide, also known by the much longer title Sonic & Mega Man: When Worlds Collide, is a 12-part crossover storyline between the franchises Mega Man and Sonic the Hedgehog announced on the San Diego Comic-Con International on July 10, 2012, published by Archie Comics' Mega Man, Sonic the Hedgehog and Sonic Universe comic books in 2013.
After the first Genesis Wave, the blue Chaos Emerald from Sonic the Hedgehog's world had disappeared. Some time later it was found by Dr. Wily in Mega Man's world, and while analyzing it, Wily accidentally entered in contact with Dr. Eggman. Both villains decided to work together, creating the Skull Egg Zone to reunite and plot against their blue nemeses, first creating the Wily Egg, where they cause a new Genesis Wave to alter the reality of their worlds, and they are the only persons who retain the memories of both their original and new lives. The timeline of the altered realities from both Mega Man's and Sonic's worlds are apparently based on the video game series instead of the comics, being set after the events of recent video games like Mega Man 10 and Sonic Generations.
The doctors proceed to collect the other Chaos Emeralds for their main plan, and they capture Sonic's friends to turn them into Roboticized Masters and help in their search. While stealing a Chaos Emerald from Mega City, Mega Man confronts the Roboticized Masters and follows them, being lured to enter Sonic's world by a Warp Ring. There, the doctors trick Mega Man and Sonic to fight each other by using Copy Robot and Metal Sonic, but unexpectedly, Dr. Light manages to bring Mega Man back to his world, alongside Sonic. After learning of their mistake and rescuing Tails, they go to Light Labs, where they witness Bass and Metal Sonic entering a Warp Ring with Dr. Light. By analyzing Dr. Light's data, Tails manages to reopen the Warp Ring and the heroes enter the Skull Egg Zone.
Mega Man, Proto Man, Rush, Sonic, and Tails confront Copy Robot and the Genesis Unit, and later the Roboticized Masters, returning them to normal one by one. Meanwhile, inside the Wily Egg, Rouge the Bat trades information with Dr. Light, and she tries to sabotage the Wily Egg, but is captured and transformed in a Roboticized Master. She, alongside an army of revived Robot Masters, are sent after the reunited heroes, now including Sonic's restored friends and E-123 Omega. Eggman notices that Dr. Light could cause trouble to their plans even while being held prisoner, and decides to kill him by dropping him from the Wily Egg, which angers Wily and makes both doctors plan to backstab each other. Rouge is restored and Dr. Light is saved by Shadow the Hedgehog, and while everyone takes care of the army of Robot Masters outside, Mega Man, Rush, Sonic, and Tails invade the Wily Egg. After dealing with several menaces, including the Mega Man Killers (with Tails being injured and sent back to the others with Rush), Chaos Devil (which is fought by Duo), Metal Sonic, and Bass, Mega Man and Sonic are captured by the doctors, and they reveal their plan to create a Super Genesis Wave to completely change their worlds.
When the group outside gain support from Dr. Light's original eight Robot Masters, Dr. Light, Proto Man, Rush, and Knuckles enter the Wily Egg and rescue the blue heroes. Eggman and Wily try to stop them with the Egg-Wily Machine X, but as they sabotaged each other, they are unable to fight and make a truce to repair it. They start the Super Genesis Wave, apparently winning, but while Proto Man and Knuckles were facing the doctors, Sonic and Mega Man used the Chaos Emerald to perform a super transformation, easily defeating the Egg-Wily Machine X. Although the reality of their worlds were completely changed, Sonic teaches Mega Man how to revert them back to normal. Mega Man successfully restores his world, but Eggman, unwilling to accept defeat, interferes with Sonic's attempt to restore the reality from their world.
- Mega Man and all those from his world retain no memory of the event as said world was restored to nearly as it was before. Mega Man himself, briefly recalled Worlds Collide only to forget it upon the Genesis Wave's effect being undone. After effects include:
- Dr. Wily despite forgetting everything had an urge to stomp on a carton of eggs, due to left over feelings of betrayal from Dr. Eggman. Incidentally, his video logs had no recollection of Dr. Eggman or the Blue Chaos Emerald.
- Proto Man regressed back into Break Man. His damages to Mega City, Mega Man, Bomb Man, Guts Man and Cut Man was undone.
- Aside from the above, Short Circuits alluded to the arc by comically implying that Break Man's attack "broke" the story for four months.
- Later, during the Dawn of X story arc, when Xander Payne was traveling forwards through time to the world of Mega Man X, he came across the part of the crossover when Mega Man and Sonic worked together to battle Tails Man, confirming that the events of the crossover are canon to the Mega Man timeline, and from Mega Man's perspective, he won't witness them until much, much later.
Sonic the Hedgehog
- Sonic the Hedgehog, Dr. Eggman, and Blaze the Cat remember the event, with Tails remembering it not long after things were restored. Due to Eggman's interference with the restoration of the world, however, Sonic's world changed greatly in contrast with Mega Man's world. Several characters ended up in different locations (Sonic the Hedgehog #252 & Sonic Universe #55). Examples include:
- History in Sonic's world has also been altered. One example of such is the events of the video game Sonic Colors being canon, as well as that being the last time that Sonic and company saw Silver the Hedgehog.
- The Wily Egg ended up in the Sol Zone. It was found by Captain Metal, who remodeled it into the Egg O' War. It was eventually powered by the Sol Emeralds, and would later contain a back up of Captain Metal's programming (revealed after Blaze destroyed his body). Using the Emeralds herself, Blaze became Burning Blaze and managed to defeated the Egg O' War which sunk to the bottom of the ocean, but is still online.
Soon, another phenomenon created in the aftermath of this event was discovered in the future of Sonic's world, Genesis Portals. Created when Sonic's multiverse was altered, these portals caused travel throughout time, space and dimension to other worlds. In the future of Mega Man's world, the diabolical Sigma discovered the Genesis Portals, and saw them as the perfect opportunity to conquer many worlds. His actions would lead to another encounter for Mega Man and Sonic's worlds, which saw the two heroes and their allies team up with heroes from other worlds, including Mega Man X's time and the alternate universe of Sonic Boom.
|0.1||Mega Man #23||March 2013|
|0.2||Sonic Universe #50||March 2013|
|0.3||Sonic the Hedgehog #247||April 2013|
|Act 1 - Kindred Spirits|
|1||Mega Man #24||April 2013|
|2||Sonic Universe #51||April 2013|
|3||Sonic the Hedgehog #248||May 2013|
|4||Mega Man #25||May 2013|
|Act 2 - Into the Warzone|
|5||Sonic Universe #52||May 2013|
|6||Sonic the Hedgehog #249||June 2013|
|7||Mega Man #26||June 2013|
|8||Sonic Universe #53||June 2013|
|Act 3 - Chaos Clash|
|9||Sonic the Hedgehog #250||July 2013|
|10||Mega Man #27||July 2013|
|11||Sonic Universe #54||July 2013|
|12||Sonic the Hedgehog #251||August 2013|
- Information revealed suggests that the crossover ultimately proved to be vital to the survival of both comics.
- Around the time the crossover was beginning, Sonic writer Ken Penders had split ties with Archie and was suing for the rights to all the characters he created for the book, which would have severely compromised the ongoing plotlines had they been removed. The use of the crossover to reboot the comic was needed to both remove his works without further legal drama while allowing for a more game-related storyline with enough elements of the comic's previous state.
- Around the time of the release of Worlds Unite, Archie writer Ian Flynn revealed that had the crossover not taken place, the Mega Man comic would most likely have been cancelled due to not meeting sales expectations. 
|When Worlds Collide Trailer||When Worlds Collide|
Editor Paul Kaminski Interview
- ↑ Protodude's Rockman Corner: Mega Man and Sonic “When Worlds Collide” Announced
- ↑ Robot Masters from Mega Man 10 are present in the crossover (one of whom, Nitro Man, was also mentioned by Mega Man regarding Sonic's speed during their fight early in the arc), and the Time Eater is mentioned. In addition, Issue 38 of the Mega Man comics series further confirms this when Xander Payne witnesses Mega Man and Sonic fighting Tails Man while traveling through time, shortly after witnessing Bass and Mega Man shooting the time anomaly from Rock of Ages, which occurred around the time of Mega Man 10 due to Dr. Light mentioning Roboenza beforehand.
- ↑ http://www.bumbleking.com/forum/viewtopic.php?f=17&t=7767&p=421509#p421416
|Sonic the Hedgehog / Mega Man: Worlds Collide|
|Sonic the Hedgehog / Mega Man: Worlds Unite|