Bubble Lead

Bubble Lead is Bubble Man's power. It throws a heavy bubble that rolls in the floors. It's Heat Man's weakness, and its the only weapon that works in the final boss from Mega Man 2, Alien, so its recommended to not use this much on the final stages.

The Doc Robot from Mega Man 3 also used this weapon along with the weapons from the other Robot Masters from Mega Man 2, but the player can't take it from Doc Robot.