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Season guide

Teenage Mutant Ninja Turtles: Season 1

26 episodes Premiered Feb 8, 2003 Updated Jul 20, 2026

Season 1 follows the four mutant turtles as they become embroiled in an escalating war with the Foot Clan. After Baxter Stockman’s robotic mousers destroy their original lair, the turtles relocate to a new sewer hideout and befriend human allies April O’Neil and Casey Jones. Throughout the season they repeatedly thwart the schemes of the Shredder, his lieutenant Hun, and Stockman. The Shredder later proposes a truce

Season overview

Season 1 follows the four mutant turtles as they become embroiled in an escalating war with the Foot Clan. After Baxter Stockman’s robotic mousers destroy their original lair, the turtles relocate to a new sewer hideout and befriend human allies April O’Neil and Casey Jones. Throughout the season they repeatedly thwart the schemes of the Shredder, his lieutenant Hun, and Stockman. The Shredder later proposes a truce to Leonardo, claiming a greater evil forces both sides to cooperate. Splinter then discloses that the Shredder and Hun were

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Episodes

S1·E1

Things Change

Feb 8, 2003 · 21 min

In their underground lair deep beneath the city streets, the Turtles and Master Splinter are suddenly attacked by a horde of Mouser robots!

S1·E2

A Better Mousetrap

Feb 15, 2003 · 21 min

The Turtles discover the source of the Mouser robots that trashed their old lair: Dr. Baxter Stockman -- a noted technological genius/inventor, who tries to pass off the Mousers as

S1·E3

Attack of the Mousers

Feb 22, 2003 · 21 min

When April O'Neil wakes up in the Turtle's lair she has major trouble dealing with the reality of four giant talking Turtles and a Zen-master rat. She soon learns of the origin of

S1·E4

Meet Casey Jones

Mar 1, 2003 · 21 min

Raphael is a little cooped up underground with only his brothers and Master Splinter. When Raphael almost clobbers Michelangelo in some brotherly sparring, it's apparent that Rapha

S1·E5

Nano

Mar 8, 2003 · 21 min

When a scientist accidentally unleashes a super-powered Nanotech monster with a childlike mind, it adopts a small-time thief as its father figure, and the mayhem begins!

S1·E6

Darkness on the Edge of Town

Mar 15, 2003 · 21 min

The Turtles, investigating a strange blackout, discover the Foot Ninja stealing a Japanese ceremonial sword from the Metropolitan Museum of Art.

S1·E7

The Way of Invisibility

Mar 22, 2003 · 21 min

After Casey Jones makes himself an unwanted guest in the Turtles' lair, Raphael takes him topside for a "breath of fresh air", where they encounter the Foot Tech Ninjas.

S1·E8

Fallen Angel

Mar 29, 2003 · 21 min

On a nightly training run, the Turtles and Casey Jones break up a Purple Dragon robbery. One of the perps is Angel, a girl Casey knows from the neighborhood who's going through her

S1·E9

Garbageman

Apr 5, 2003 · 21 min

The boys have made friends with a group of homeless, and are worried when they start mysteriously disappearing into the night!

S1·E10

The Shredder Strikes (1)

Apr 12, 2003 · 21 min

Oroku Saki (aka the Shredder) attempts to convince Leonardo that Saki is fighting the good fight ... that he's out there carrying on the great tradition of Bushido and Ninjitsu, an

S1·E11

The Shredder Strikes (2)

Apr 19, 2003 · 21 min

Our four turtles stand facing their most formidable foe to date ... the Shredder. Beaten and battle weary, the turtles get separated from one another during the martial arts mayhem

S1·E12

The Unconvincing Turtle Titan

May 3, 2003 · 21 min

Believing the Turtles can accomplish so much more for the city, and inspired by iconic superhero Silver Sentry, Michelangelo decides to take a crack at being a superhero.

S1·E13

Notes from the Underground (1)

May 10, 2003 · 21 min

When Don's examination of some mysterious crystals attracts the attention of a subterranean monster, the Turtles underground exploration unearths a Foot Genetics Lab!

S1·E14

Notes from the Underground (2)

May 17, 2003 · 21 min

After discovering an abandoned underground Foot Genetics Lab, and being attacked by once-human Digging Creatures, the Turtles assist those very creatures in trying to repair a Forc

S1·E15

Notes from the Underground (3)

May 24, 2003 · 21 min

After befriending the once-human creatures in an abandoned underground Foot Genetics Lab, the Turtles join them on a journey deeper into the earth, where they come upon the ruins o

S1·E16

The King

May 31, 2003 · 22 min

With all the turtles living in April's apartment, things are getting a little crazy. But, when Donatello stumbles upon a fantastic monster in the basement, things get crazier.

S1·E17

The Shredder Strikes Back (1)

Jun 7, 2003 · 21 min

On a training run Leo is ambushed by a major Foot attack force, including Foot Tech Ninjas, their old enemy Hun, and a new threat: the Foot Elite!

S1·E18

The Shredder Strikes Back (2)

Jun 14, 2003 · 21 min

When the Foot Ninja attack April's apartment in force, the Turtles fight against overwhelming odds to get the wounded Leo to safety.

S1·E19

Tales of Leo

Sep 13, 2003 · 21 min

The Turtles, Splinter, Casey and April just barely manage to escape from the explosion that destroys the antique store. They hit the road and hide out at Casey's grandmother's old

S1·E20

The Monster Hunter

Sep 20, 2003 · 21 min

Still recuperating up at Casey's grandmother's farm, the turtles are feeling the sting of boredom. Luckily, a scientist known as the "Monster Hunter" has come to the area searching

S1·E21

Return to New York (1)

Sep 27, 2003 · 21 min

The Turtles return to New York with one goal in mind: to destroy the Shredder once and for all.

S1·E22

Return to New York (2)

Oct 4, 2003 · 21 min

The Turtles and Splinter continue to fight their way up through the Foot Headquarters skyscraper, facing down three misshapen Mutant Shredder Clones, a hallway of traps, and the My

S1·E23

Return to New York (3)

Oct 11, 2003 · 21 min

With Stockman showing up in the middle of the final battle between our heroes and the Shredder, everything is thrown into chaos ... so much so that our heroes must join forces with

S1·E24

Lone Raph and Cub

Oct 18, 2003 · 21 min

With Splinter mysteriously vanished, the Turtles are feeling frustrated, not knowing where to start looking. Impatient with strategizing, Raph heads off on his own - and straight i

S1·E25

Search for Splinter (1)

Oct 25, 2003 · 21 min

After the frustrated Turtles exhaust their search for Splinter, their suspicions turn to the Guardians, and the trail soon leads them to a non-descript building, the initials of it

S1·E26

Search for Splinter (2)

Nov 1, 2003 · 21 min

The Turtles successfully infiltrate the mysterious TCRI Building, where they manage to sneak into its inner sanctum, and locate the unconscious Splinter inside a stasis tank.