Alien

The Alien is the final boss in Mega Man 2.

Strategy
When Dr. Wily jumps out of the flying saucer, Wily will turn into a green alien. It only has one attack, it shoots at Mega Man. It's best to use the Bubble Lead from Bubble Man, the easiest way to defeat it. After that, the alien turns back into Dr. Wily and the game is finished.

Easy
The Bubble Lead makes the boss lose 2 HP during the battle.

Hard
The bubble Lead makes the boss lose only 1 HP during the battle.

Trivia
Quick Man in Captain N looks like the Alien.

This was the first boss to be introduced after defeating the Wily Machine.