Coming in May, 2015, Archie Comics will be releasing a Free Comic Book Day prelude to Sonic and Mega Man: Worlds Unite. As per tradition, it's a flip book combining content from both the Mega Man and Sonic the Hedgehog series, acting as a primer for impending crossover event. Here's the solicitation:
"Worlds Unite: PRELUDE" - It's TWO free comic books in ONE! Just in time for the start of the ALL-NEW epic Sonic the Hedgehog and Mega Man crossover event, "Worlds Unite," comes a primer issue exclusively for Free Comic Book Day! The road to "Unite" began in the history-making "Worlds Collide" storyline, continued in 2013's "DAWN OF X" storyline, and once again our heroes must meet-Mega Man's journey chronicled on one side, and Sonic the Hedgehog's on the other! This is the must-have primer for the biggest comic book event of 2015-as two video game icons must come together... or risk dying alone! Featuring art from both Sonic and Mega Man comic book fame!
(W) Ian Flynn (A) Ryan Jampole, Various (CA) Ben Bates
Source: Archie Comics