Mega Man 5
Mega Man 5 Walkthrough Spanish: Stage Route and Story Setup
A Mega Man 5 walkthrough is easiest to follow in order, and the first stage is a good place to start. Here is the route, plus what the story sets up.
Mega Man 5
Mega Man 5 Boss Weaknesses and Fight Order Quick Reference
Star Man is weak to the Mega Buster, and the weapon you win from him, Star Crash, beats Gravity Man. Here is the chain for the other bosses.