TYPE: Boss, Mammal, Mechanical.
AFFILIATIONS: Koopa Troop.
CLOSE RELATIVES: Major Burrows.
SKILLS AND ATTACKS: Bubble blast, Electro-ball.
STRENGTHS: In Golden Leaf Galaxy, he has an area of spikes surrounding him.
WEAKNESSES: The glass casing on top of his machine.
BACKGROUND: Undergrunt Gunner was supposedly a relative of Major Burrows, he is a mole with blue fur and always sits inside a cannon. He had no-one to blast so he was glad to be hired to blast Mario.