Junker (called Super Ultra Great Mega Trashy Monster Junker Bot by Midbus) is a boss
fought near the end of Mario & Luigi: Bowser's Inside Story. It is a robotic creature
resembling a trash can. It is helped by several smaller monsters known as Junker Cans.
Junker is encountered while infiltrating Peach's Castle near the end of the game. Upon
entering a certain area of the garden, Starlow will comment that there is a lot of garbage
laying about. After Mario and Luigi progress to the end of this area, Midbus appears,
holding some sort of remote control. When it is activated, Junker springs to life from the
piles of garbage laying around the area. After Midbus's attempts to control it fail, he
smashes the remote and allows it to fight the Mario Bros. on its own. Midbus's attempt to
control the Junker may demonstrate why it was in the garbage in the first place, as it
began to dance when he commanded it to attack.
In battle, Junker has a variety of attacks.
One attack consists of throwing a bucket over either Mario's or Luigi's head. The brother
will then stumble around blindly while Junker throws Thwomps at him. Players must cause
the brother to jump with good timing to avoid the attack. If Mario or Luigi are hit by the
Thwomp, they may get dizzy. This attack is a reference to the Super Famicom game Mario &
Wario.
Another attack involves throwing two balls of metal scrap at a bro, then attempting to ram
him. The Mario brother in question must jump onto the balls, then jump over Junker as it
attempts the ramming portion of the attack.
A third attack consists of emptying the garbage from one of the Junker Cans that follow
it. Often, this garbage will consist of random enemies that go after the Mario bros, which
include: Cheep Cheep, who will jump over the Mario Bros., which will hurt them when they
jump, Bob-omb, who will first light its fuse before charging, and Scutlet, which will
immediatly charge after coming out. It will also have useless stuff like a pair of briefs
and a wad of paper. Once several enemies have attacked, the Junker Can will be discarded.
The Junker may also choose to hinder the Mario bros. by incapacitating Luigi. It does this
by putting Luigi into a Junker Can. Since this attack cannot be dodged, Mario will be
forced to defeat the Junker Can to rescue his brother. However occasionally, Luigi will
hit the rim, and escape. If he is not freed, and Mario dies, the player will get a game
over, provided he or she has no Retry Clocks.
After the battle, Junker begins to malfunction again, rampaging around and freeing Bowser
from captivity in the process. It then destroys itself by running into a locked gate,
opening said gate in the process. This allows the Mario bros. to access a pipe connecting
Peach's Castle to Pipe Yard.