Bowser X

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Bowser X
An artwork of the X boss before fighting it. In this case, it's Bowser.
Artwork shown before the battle in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey
Species Koopa
First appearance Mario & Luigi: Bowser's Inside Story (2009)
Latest appearance Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey (2018)

Bowser X is an optional boss that appears in Mario & Luigi: Bowser's Inside Story, its 3DS remake, and Mario & Luigi: Dream Team. This upgraded form of Bowser only appears in the Gauntlet in the Challenge Node and the Battle Ring in Pi'illo Castle respectively.

In Mario & Luigi: Bowser's Inside Story, to get to him, the player must beat all X bosses, and then face all the other X bosses in a row before facing Bowser X. He is the only X boss without a color change from the original and is the only boss not mentioned in the Prima Games guide. In Mario & Luigi: Dream Team, he is faced twice: once in normal form alongside Antasma X in his bat form, and again in giant form. He is the second normal X boss faced, and the final giant X boss.


Mario & Luigi: Bowser's Inside Story / Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey[edit]

Like all the other X Bosses in the Challenge Node, Bowser X has upgraded stats. He is capable of performing all of the original Bowser's attacks, more specifically from the battle in Toadley Clinic, as well as three new ones based on more abilities Bowser has learned through the game. However, Bowser X only uses two of his Brawl Attacks (unless Bowser did not rescue Shy Guy Squad). The attacks Bowser X performs during battle include:

  • Punch - A variant of Bowser's fist attack, which is much stronger than the original one. Mario and Luigi must jump to avoid taking damage. Every once in a while, his nostrils smoke out; when this happens, he attacks much quicker than normal but completely misses the punch and jumps over the Bros. Mario and Luigi should not jump during this attack.
  • Flame - Bowser's trademark flame breath attack. It can be avoided by grabbing onto Starlow before Bowser X launches the attack. If the player misses, the attack deals massive damage to the Bros.
  • Goomba Storm - This attack has two phases. At first, Goombas run after Mario and Luigi, while Bowser X sets some of them on fire. After that, the burning Goombas fall from the sky and the Bros. must use the hammer attack to hit them back. They move at a much faster speed than the original.
  • Shy Guy Squad - This attack is similar to Bowser's attack. It can be countered by a timed hammer attack. This variant, however, bounces back onto the rope then back at the Bros. at a slightly faster speed. This can be countered multiple times.
  • Fireball - Bowser X shoots a simple fireball at one of the Bros., which doesn't do much damage, but he continues to execute this attack up to 10 times until countered. The Bros. must hammer the fireball back at Bowser X to damage him. Doing this causes Bowser X to curl up into a ball and head for the upper portion of the screen; there, a rain of fireballs drops from Bowser X at random times. The Bros. must hammer the fireballs when they're directly above. For the final part of this attack, Bowser X (still curled up) attempts to ram himself into one of the Bros., heavily damaging them if not countered. When countered, Bowser X flies off screen, then reappears trying to ram the other Bro.
  • Giant Bowser X - Bowser X grows in size and attacks the Bros. with a barrage of fireballs. One can tell when an oncoming fireball is heading toward one of the Bros. as Bowser will clench his fist upon firing it. The Bros. should jump only when the fireballs head directly toward them, and remain on the ground when the fireball passes overhead; in the remake, all fireballs must be hammered. After Bowser X finishes, he proceeds to chase the Bros. through a series of fiery obstacles; to avoid major damage, the Bros. must jump over said obstacles and head for the two Trampolines waiting at the end, this attack is similar to an attack used by the Dark Star Core.
  • Vacuum - A counter move used every time the player uses a Bros. Attack. Bowser X inhales the used move, making it inaccessible for five turns.
  • Fury - In the 3DS version, when Bowser X's HP is low, he gets the Fury status effect. The instant this happens, he will use a Drumstick to recover all of his HP.

Mario & Luigi: Dream Team[edit]

During the first battle against Bowser X, he is accompanied by Antasma X in his bat form in Class 2 of the regular battle ring. Bowser X uses all the same tactics Bowser does for this battle: He can spew purple waves of fire at Mario before launching a bigger flame attack that Mario must jump over. He can also roll up into his shell and chase Mario through the foreground, creating flames that Mario must avoid while running; the red flames are avoidable by jumping, while the purple ones must be avoided completely. Bowser X will also attempt a sliding punch, which Mario must counter with his hammer; before punching, Bowser X may teleport behind Mario to catch him off guard. Unlike the regular battle where Antasma is forcibly popped out of Bowser and they retreat, Bowser X and Antasma X explode in defeat, possibly due to a lack of story in the Battle Ring, as it's part of the story that Bowser and Antasma escape.

Bowser X is also fought in Giant Class 5 as a giant boss. This fight is mostly the same as its story equivalent. However, his attacks are slightly stronger and faster, and his stats are increased. He also has slightly different attack patterns, and a turn limit of 6 is given.


Mario & Luigi: Bowser's Inside Story[edit]

Mario & Luigi: Bowser's Inside Story enemy
Bowser X
Bowser's battle animation HP 7,155 (10,732) POW 316 (790) DEF 194 (291) SPEED 144 (216) Coins 0 (0)
Level 50 Fire Normal Burn? Immune Battled by Mario and Luigi Location(s) The Gauntlet
Dizzy? Immune Stat down? Normal KO? Immune Experience 0 Item drop --
Notice: The second set of numbers next to the enemy's HP, POW, DEF, SPEED and Coins are stat increases from the Challenge Medal accessory; a 50% increase for HP, DEF, SPEED and Coins earned, and a 150% increase for POW.

Mario & Luigi: Dream Team[edit]

Mario & Luigi: Dream Team enemy
Bowser X (1)
Bowser first idle frame in Mario & Luigi: Dream Team HP 771 Power 173 Defense 135 Speed 43
Level 19 No Hitter Weakness None Location(s) Battle Ring
World Dream Experience 0 (0) Coins 900 (100%) Item drop None (0%)
None (0%)
Mario & Luigi: Dream Team enemy
Bowser X (2)
Bowser X HP 3500 Power 714 Defense 500 Speed 999
Level 40 No Hitter Weakness None Location(s) Battle Ring
World Dream Experience 0 (0) Coins 2400 (100%) Item drop None (0%)
None (0%)

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey[edit]

Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey enemy
Bowser X
Bowser idle battle sprite as an enemy HP: 5800 POW: 264 DEF: 192 SPEED: 144 Experience: 0
Fire: Normal Jump: Normal Hammer: Normal Battled by: Mario & Luigi Coins: 0
Burn: Immune Dizzy: Immune Stat down: Immune Speed down: Immune Item drop: None - 0%
None - 0%
Level:           45 Location(s): The Gauntlet


Names in other languages[edit]

Language Name Meaning
Japanese クッパX
Kuppa X
Bowser X
German Bowser X -
Italian Bowser + -
Russian Боузер+
Spanish Bowser X -