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Bowser's Inside Story Enemy
Kretin Beta.png Kretin Alpha.png Alpha Kretin 2.png
Beta Kretin (left) and Alpha Kretin.
Location(s) Flab Zone
Battled by Mario & Luigi
Level 11
HP Alpha - 20/30 (with challenge medal), Beta - 385/578 1 (clone)
Power 40/100
Defense Alpha - 24/36, Beta - 39/59
Speed Alpha - 30/45, Beta - 42/63
Fire Normal
Burn? Immune
Dizzy? Immune
Stat Down? Double
KO? Normal (Alpha)
Immune (Beta)
Double (Beta Clone)
Experience 700
Coins 200/300
Item Drop Max Syrup Jar, Mushroom
Internal ID

Kretin is a molecule with two forms called Alpha Kretin and Beta Kretin who, in Mario & Luigi: Bowser's Inside Story, kidnaps Princess Peach. After a long chase in the Flab Zone, Mario & Luigi finally reached Kretin. Using the spin move, Mario and Luigi free Peach from the grips of it, but immediately get attacked by Kretin.

In battle, Kretin will begin in its Alpha Kretin form. Each individual unit of Kretin can be either red or green, and can only be damaged by the Mario brother of the corresponding color. When one unit receives enough damage, it turns blue and is defeated. After all the six parts of Kretin are blue, it will fall apart and become six Beta Kretin similar to the Kamek battle from the previous game, all but one of the units will be fakes in this form, so the vulnerable unit will try to hide by rapidly switching places with the others. If any of the fakes are hit, the real one will make another one the next turn.

The Alpha Kretin's only attack is creating a ball of blue electric energy that will move through its body. It will then start to glow, turning its arm into a cannon shape. The Alpha Kretin will start to shoot balls of energy towards the bros, red for Mario and green for Luigi. This attack is countered with hammers if hit the bros. can get a DEF-Down. In its Beta Kretin form, it will create five duplicates of itself and start to jump around, trying to confuse the player by jumping to a different position. If a fake Beta Kretin is defeated, the real one will just create another copy. Its main attack is surrounding the bros in a hexagon shape. They will all start to charge up electricity. When one of the Kretins jump, that's where the electricity will move on to. This attack can be avoided by jumping. After the fight, Kretin is defeated.

Kretin X[edit]

Main article: Kretin X

After facing the original Kretin, the Mario Bros. can face an even stronger version of the boss. The color scheme is different from the original. This boss is reachable at The Gauntlet in the Challenge Node.

Names in other languages[edit]

Alpha Kretin[edit]

Language Name Meaning
Japanese アルカロテン
Aru Karoten
Spanish (NOA) Kretina Alfa Alpha Kretin
Spanish (NOE) Karotenio From α-carotene
French (NOE) Alphacaro From α-carotene
German Alpha-Karotino From α-carotene
Italian Alfa Carotene From α-carotene

Beta Kretin[edit]

Language Name Meaning
Japanese ベタカロテン
Beta Karoten
Spanish (NOA) Kretina Beta Beta Kretin
Spanish (NOE) Betakarotino From β-carotene
French (NOE) Bétacaro From β-carotene
German Beta-Karotino From β-carotene
Italian Beta Carotene From β-carotene


  • Alpha Kretin vaguely resembles the logo of AlphaDream, the company that created the Mario & Luigi series.
  • "Kretin" comes from "keratin" and "cretin."
    • In the UK version of the game, the boss is known as Alpha and Beta Keratin, without being a pun on "cretin."