JEFF THE LAND SHARK
(Earth-33129)

Real Name: Jeff

Identity/Class: Alternate reality (Earth-33129) genetically-engineered creature (Land Shark)

Occupation: Pet

Group Membership: None

Affiliations: Avengers (Black Widow/Natalia Romanova, Captain America/Sam Wilson, Hawkeye/Clint Barton, Hulk/Bruce Banner, Iron Man/Tony Stark, Thor/Odinson), Black Panther (T'Challa), Doctor Strange (Stephen Strange), Scarlet Witch (Wanda Maximoff), unidentified mermaid

Enemies: None

Known Relatives: None

Aliases: None

Base of Operations: Avengers Tower, New York City

First Appearance: It's Jeff & the Avengers episode "Merry Shark-Mas" (December, 2023)

Powers/Abilities: Jeff is a Land Shark, a quadrupedal shark able to live on land and breathe oxygen.

    He is also able to breathe underwater.

    He is capable of walking on his hind legs and performing delicate tasks with his front paws.

   Despite being unable to speak, Jeff possesses greater intelligence than common animals. He can communicate with his human caretakers through gestures and grunts and has decent understanding of societal customs.

Height: Unrevealed (approximately 2'1")
Weight: Unrevealed (approximately 22 lbs.)
Eyes: Black
Hair: None

History: (It's Jeff & the Avengers episode "Merry Shark-Mas" (fb) - BTS) - Jeff the Land Shark lived in Avengers Tower with the Avengers.

(It's Jeff & the Avengers episode "Merry Shark-Mas") - As the Avengers were opening their Christmas presents, Jeff brought a sack of his own. The Avengers opened Jeff's presents, which all consisted of rotting marine animals. The Hulk brought out their own present, which Jeff assumed to be a tasty treat and was disappointed to find was actually just socks.

(It's Jeff & the Avengers episode "Bird-Brain") - Iron Man left Jeff alone in his workshop. A bird flew in and got stuck inside an Iron Man armor glove. She activated its repulsors, which began blasting in random directions. Jeff got into an Iron Man armor boot and flew around in it until the bird shot him down. Jeff grabbed the Iron Man armor helmet and messed around with it until the repulsor glove was deactivated. The Avengers returned to find the workshop in ruins.

(It's Jeff & the Avengers episode "Super Size Me") - Black Widow and the Hulk took Jeff to a park, where a record for world's largest pizza was attempted. Jeff smelled the pizza and became hungry, but found its gigantic shape too difficult to eat. He ran back to the Hulk and stole a potion from his bag, eating it and growing to approximately 80 feet tall. As civilians ran away in panic, Jeff went back to the giant pizza and ate it whole, at which point the potion wore off, returning him to his regular size.

(It's Jeff & the Avengers episode "The Doctor Is In") - Jeff was walking past the Sanctum Sanctorum, saw the door being opened and let himself in. Inside, he saw a glowing green gem, which he swallowed whole. This caused him to swap bodies with Doctor Strange, putting Jeff's shark head onto the human body and Strange's human head onto the shark body. Jeff panicked, while Doctor Strange attempted to undo their condition but had trouble manipulating the shark paws. Jeff grabbed a piece of rotting cheese and made Doctor Strange eat it; this caused Strange to barf and vomit the gem out of the shark body, which returned both of them to normal.

(It's Jeff & the Avengers episode "The Case of Dr. Jeff & Mr. Jeff") - As the Hulk was working in his laboratory, Jeff tried to steal his lunch but was prevented from doing so. Bored, Jeff began licking various surfaces and ingested a spilled liquid which turned him purple, manic and frenzied. He began eating everything in sight, but whenever Hulk would look at him, Jeff would appear normal. The Hulk poured an antidote onto his lunch and let Jeff eat it, which restored him to normal permanently.

(It's Jeff & the Avengers episode "Dream a Little Dream") - Black Widow took Jeff on a walk in a park. Jeff saw a cotton candy stall but could not reach it. He then suddenly became able to fly, allowing him to freely munch on the cotton candy as well other snacks in the park. Jeff then woke up with a pillow in his mouth back in Black Widow's apartment, where he had ruined a bunch of furniture while munching in his sleep.

(It's Jeff & the Avengers episode "Witchy Woman") - Jeff saw Vision and Scarlet Witch having fun on a date. Rushing back home, he made a romantic card and ran with it into the ocean, only for the card to get wet and fall apart. Jeff made another card and showed it to Scarlet Witch, who took it to a store and had it laminated. His card now unaffected by water, Jeff swam into the ocean and presented the card to his mermaid friend.

(It's Jeff & the Avengers episode "Jeff Tech") - Jeff was in Wakanda with Black Panther. T'Challa presented him with a small hovercar, in which Jeff had some fun riding around but quickly became bored with it. Jeff then used Black Panther's assembly machine to enhanced the vehicle, turning it into a powerful four-wheeled car. He rode it around the workshop until eventually crashing it. Black Panther returned to find Jeff in the middle of the mess and ordered him to clean it up.

(It's Jeff & the Avengers episode "Trick or Teeth") - On Halloween, Jeff went trick-or-treating with Black Widow and Hawkeye, wearing the costume of an even bigger land shark. He encountered various monsters, all of whom turned out to be people in costumes. Others attempted to take some of Jeff's candy but reconsidered as soon as he bared his sharp teeth.

   It's Jeff & the Avengers is a web series released on Marvel HQ, Marvel's official family platform. The episodes lack animation or production credits, while the writer and the artists are only revealed in the accompanying article on Marvel.com.

   The series was the first animated appearance of Jeff the Land Shark. Since then, he had also appeared in LEGO Marvel Avengers: Mission Demolition (reality-13122) and Marvel's Spidey and His Amazing Friends (reality-21642).

   This profile was completed 01/03/2026, but its publication was delayed as it was intended for the Appendix 25^th anniversary 's celebratory event.

CLARIFICATIONS:
Jeff the Land Shark of Earth-33129 should not be confused with:

• JEFF THE LAND SHARK of Earth-616--West Coast Avengers III#7
• or any other "Jeff" or "Land Shark" characters

images: (without ads)
It's Jeff & the Avengers episode "The Case of Dr. Jeff & Mr. Jeff" (main image)
It's Jeff & the Avengers episode "Merry Shark-Mas" (headshot)
It's Jeff & the Avengers episode "The Doctor Is In" (body-swapped with Doctor Strange)

First Posted: 09/22/2026
Last updated: 01/04/2026

Any Additions/Corrections? please let me know.

Non-Marvel Copyright info
All other characters mentioned or pictured are ™  and © 1941-2099 Marvel Characters, Inc. All Rights Reserved. If you like this stuff, you should check out the real thing!
Please visit The Marvel Official Site at: http://www.marvel.com

Special Thanks to www.g-mart.com for hosting the Appendix, Master List, etc.!

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