"When Worlds Collide, Part Five: The Advance Guard"
"Off Panel"
Continued from Mega Man #25 and continues in Sonic the Hedgehog (1993) #249.
*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! *Source: archiecomics.com
Collected in Sonic/Mega Man: Worlds Collide TPB Vol 2.