The Mega Pig 9000 is a boss in Angry Birds Space. It is a giant battle robot where King Pig sits at the top. On one arm, it has a cannon that shoots rocks in bubbles, the other arm has a hand wich does nothing, the hand can be destroyed. The way to destroy it is to hit the rocks in bubbles (the ones that were shot by the robot), so that they hit the robot, therefore defeating it.
When you win, King Pig hits the red button, and the torso of the robot becomes a spaceship and the limbs fall off. King Kig escapes in it.
Note: I got the name from angry birds craptastic adventures- the new asistant. (It was the name of the cardboard robot that the pigs made).