Sigma--the brilliant villain from the future--has fused the worlds of Sonic the Hedgehog and Mega Man together! Now he feeds on the super-planet's energy to become unstoppable! It's up to Sonic and Mega Man to raise an army to fight the time-hopping villain. Joining them are the Freedom Fighters, the Robot Masters, X and his Maverick Hunters, Sticks and her friends, and--Dr. Eggman and Dr. Wily?!

"Originally published in single magazine form in Sonic Universe #77, Sonic Boom #9, Sonic the Hedgehog #274, Mega Man #50-51, Sonic worlds unite: battles #1 and Mega Man worlds unite: battles #1."--Title page verso.