Reprints parts of Mega Man #23 and Sonic the Hedgehog (1993) #247.
Continues in Mega Man #24.
*"Worlds Collide: Prelude" - It's two free comic books in one! Just in time for the start of the epic Sonic the Hedgehog and Mega Man crossover event, "Worlds Collide," comes a primer issue exclusively for Free Comic Book Day! Witness the journey these two epic heroes from both Sega and Capcom took to finally meet each other - 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 2013 - as video game icons Sonic the Hedgehog and Mega Man meet for the very first time anywhere - featuring art from both Sonic and Mega Man comic book fame!
*Source: freecomicbookday.com