"When Worlds Collide," Part Six of Twelve. The crossover mega-event reaches its half-way point! On the eve of Sonic the Hedgehog's landmark 250th issue, Sonic, Tails, Mega Man and Proto Man are confronted by Drs. Eggman and Wily and the eight Roboticized Masters! Why do they look so familiar to Sonic? Do our heroes even stand a chance?!

The sequel to the record-shattering Sonic the Hedgehog and Mega Man crossover is here! You saw what happened when "Worlds Collide!" Now brace yourself for when WORLDS UNITE! Dark forces have come together in the far future! The vicious conqueror Sigma has cheated death again and escaped the justice of X and the Maverick Hunters. He's crossed space and time to join forces with Zavok and the malicious Deadly Six of Lost Hex! Sonic and Mega Man could save us--but they've gone missing! Now the Freedom Fighters of Sonic's world and the Robot Masters of Mega Man's world must take up the fight to save their heroes and stop the coming tide of darkness! WORLDS UNITE features guest appearances by the cast of SONIC BOOM, MEGA MAN X and some of CAPCOM and SEGA's biggest stars! This volume collects WORLDS UNITE parts 1-4, including SONIC UNIVERSE #76, SONIC BOOM #8, SONIC THE HEDGEHOG #273, MEGA MAN #50 (includes 10 extra pages of story!) and selections from the MEGA MAN: WORLDS UNITE BATTLES one-shot, and also includes bonus materials such as creator spotlights, production art, and 21 pages of cover images. From the Trade Paperback edition.

The historic Sonic the Hedgehog and Mega Man crossover event rolls on! “When Worlds Collide,” Part Seven of Twelve. The hunt for the Roboticized Masters continues as Sonic and Mega Man face down Shadow Man and – Shadow Man? Meanwhile, Drs. Eggman and Wily gloat over the captive Dr. Light. But what is the brilliant, bearded scientist preparing to do? Featuring stunning new cover art from Patrick “SPAZ” Spaziante!

The second act of the epic Sonic the Hedgehog and Mega Man crossover event BEGINS HERE! "When Worlds Collide," Part Five of Twelve. Sonic, Mega Man, Tails and Proto Man enter the strange world of the Skull Egg Zone. They don’t receive a warm welcome, either, as the Genesis Unit and Copy Robot attack! Drs. Eggman and Wily wait in the wings with an even more sinister surprise waiting to be unleashed! You cannot miss this action-packed issue, featuring new cover art by Patrick “SPAZ” Spaziante!

The crossover event of 2013 continues here! There are strange things afoot as Mega Man's world is menaced by a super-fast, blue attacker. Sonic's world is being stalked by a blue-armored figure with a cannon for an arm. Could these mysterious villains be Sonic and Mega Man? Or are they some kind of sinister copies? Mistaken identities and explosions galore in this explosive second part to the historic Sonic the Hedgehog and Mega Man crossover! Continues in this month's Sonic the Hedgehog #248!"

"When Worlds Collide," Part Four of Twelve. It's Sonic versus Mega Man — Round Two! Celebrate 25 issues of Mega Man with the throwdown brawl to end all throwdown brawls! The Blue Bomber has the home field advantage this time — can Sonic keep up in this unfamiliar city? Meanwhile, Drs. Eggman and Wily make their boldest move yet in their master plan! This milestone issue marks the dramatic conclusion to the first act in the biggest crossover story of 2013!

"Worlds Collide," Part One. The crossover event of 2013 starts here! The Mega Man/Sonic the Hedgehog epic kicks off with a bang as the Blue Blur and Blue Bomber meet for the first time! And considering how hard they're fighting each other, it might be the last! Why are the heroes trying to take each other down? Drs. Eggman and Wily know, and they're loving every minute of it! You cannot miss this historic first meeting of two of the biggest video game icons in the entire world!

SONIC is SPEEDING down the Dragon Road in “Wings of Fire” Part One: Sonic and the Freedom Fighters travel to city-state of Chun-nan in search of more Gaia Keys! Dulcy the dragon is bringing all her might to help, but is her fledging team ready for end-of-the-world stakes? Could anyone really be? Then in “Homesick,” Bunnie and Tails come to the aid of a Key Guardian in a time of crisis!

Moving at the speed of sound, keeping the world free from robotic tyranny—it's SONIC THE HEDGEHOG! One of the oldest, most beloved videogame icons speeds into brand new comic book stories with new friends, new foes and new adventures! The entire planet has been rocked by Dr. Eggman's Super Genesis Wave! Sonic wakes up to world and a life he doesn't recognize! It's up to him to gather up his friends, the Freedom Fighters, and figure out what's been changed. Meanwhile, below his very feet, a new threat is threatening to burst out! SONIC THE HEDGEHOG 1: COUNTDOWN TO CHAOS collects SONIC THE HEDGEHOG #252-256. From the Trade Paperback edition.

The Super Sonic Warrior returns in “Genesis of a Hero” Part Three: The 25th anniversary celebration continues with another blast to the past! Which is also to the future, and the past, and back again! When Sonic goes to see the annual return of Little Planet, he’s surprised to find it chained to a mountain! Join us for the exciting adventures of Sonic CD! Featuring cover art by the legendary Patrick Spaziante.