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Monster Arm (character)

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You'll never get rid of me! I'm part of you now! You can treat the symptoms, but you'll never cure the virus!
―Monster Arm's last words

The Monster Arm was Marco's replacement right arm that appeared in the Star vs. the Forces of Evil episode of the same name.


Physical appearance

The arm is basically a large tentacle creature with a pink underside and light pink suction cups. Most of the arm is deep blue, and fades to purple at the tip of the tentacle, covered in pink slime. Its teeth are dull yellow and sharp, and it has a light pink tongue with spikes.

Role in the series

In its debut appearance, the Monster Arm is created by accident when Star tries to fix Marco's broken arm with her wand. The arm already shows it is beyond Marco's control, and begins making his social life difficult. After it beats Lars up and catching the attention of Jackie and other girls, Marco takes a liking to his new Monster Arm, and sees it as an advantage against his rival, Jeremy Birnbaum.

The evil within the Monster Arm would eventually begin to rub on Marco as he becomes very aggressive and hostile towards Star and his determination to beat Jeremy, and get Jackie Lynn Thomas to like him. Unknown to him, the Arm has other plans: to slaughter all humans and feast on the bowels. When Marco finds out about its intentions and finally sees it to be a bad influence on him, he gets Star to change it back to his normal arm. Before it is completely gone, the Monster Arm threatens that it would remain a part of Marco and would never be permanently gone.


v - e - d
StarVTFOE Logo

Star vs. the Forces of Evil | Star vs. The Dungeon of Evil | Creature Capture | Star and Marco’s Guide to Mastering Every Dimension | Comic Books


Star Butterfly | Marco Diaz | Pony Head | Ludo | King and Queen Butterfly | Ferguson | Alfonzo | Jackie Lynn Thomas | Janna | Brittney Wong | Mr. and Mrs. Diaz | King Pony Head | Oskar Greason | Miss Skullnick | Tom | Laser Puppies | Charlie Booth | Chantelle | Sabrina | Jeremy Birnbaum | Justin | Buff Frog | Buff Frog's Tadpoles | Andrea | Lars | Monster Arm | Principal Skeeves | Dojo Sensei | Ludo's Army | Glossaryck | Pixie Empress | Princess Smooshy | Toffee | Father Time | Helios | Miss Heinous | Mina Loveberry


Season One: "Star Comes to Earth" / "Party With a Pony" | "Match Maker" / "School Spirit" | "Monster Arm" / "The Other Exchange Student" | "Cheer Up Star" / "Quest Buy" | "Diaz Family Vacation" / "Brittney's Party" | "Mewberty" / "Pixtopia" | "Lobster Claws" / "Sleep Spells" | "Blood Moon Ball" / "Fortune Cookies" | "Freeze Day" / "Royal Pain" | "St. Olga's Reform School for Wayward Princesses" | "Mewnipendance Day" / "The Banagic Incident" | "Interdimensional Field Trip" / "Marco Grows a Beard" | "Storm the Castle"
Season Two: "My New Wand!" / "Ludo in the Wild" | "Mr. Candle Cares" / "Red Belt" | "Star on Wheels" / "Fetch" | "Star vs. Echo Creek" / "Wand to Wand" | "Starstruck" / "Camping Trip" | "Starsitting" / "On the Job" | "Goblin Dogs" / "By the Book" | "Game of Flags" / "Girls' Day Out" | "Sleepover" / "Gift of the Card" | "Friendenemies" / "Is Mystery" | "Hungry Larry" / "Spider With a Top Hat" | "Into the Wand" / "Pizza Thing" | "Page Turner" / "Naysaya" | "Bon Bon the Birthday Clown"


Royal Magic Wand | Dimensional Scissors | Magic Instruction Book | Wheel of Progress


I'm from Another Dimension | Closing Theme | Space Unicorn


Mewni | Echo Creek | Echo Creek Academy | St. Olga's Reform School for Wayward Princesses | Diaz House | Quest Buy | Ludo's Castle | Pixtopia

See Also


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