Attack of the 50-Foot Irma
Teenage Mutant Ninja Turtles (1987 cartoon) episode
Attack of the 50-foot Irma Title Card.png
Season Code: 03
Episode: 03
Original airdate September 27, 1989
Written by Rowby Goren
Episode chronology
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"Turtles on Trial" "The Maltese Hamster"
Teenage Mutant Ninja Turtles 1989 Season
October 19, 1989 - December 22, 1989
List of Teenage Mutant Ninja Turtles episodes


  1. "Beneath These Streets"
  2. "Turtles on Trial"
  3. "Attack of the 50-Foot Irma"
  4. "The Maltese Hamster"
  5. "Sky Turtles"
  6. "The Old Switcheroo"
  7. "Burne's Blues"
  8. "The Fifth Turtle"
  9. "Enter the Rat King"
  10. "Turtles at the Earth's Core"
  11. "April Fool"
  12. "Attack of Big MACC"
  13. "The Ninja Sword of Nowhere"
  14. "20,000 Leaks Under the City"
  15. "Take Me to Your Leader"
  16. "Four Musketurtles"
  17. "Turtles, Turtles Everywhere"
  18. "Cowabunga Shredhead"
  19. "Invasion of the Turtle Snatchers"
  20. "Camera Bugged"
  21. "Green With Jealousy"
  22. "Return of the Fly"
  23. "Casey Jones - Outlaw Hero"
  24. "Mutagen Monster"
  25. "Corporate Raiders from Dimension X"
  26. "Pizza by the Shred"
  27. "Super Bebop & Mighty Rocksteady"
  28. "Beware the Lotus"
  29. "Blast from the Past"
  30. "Leatherhead: Terror of the Swamp"
  31. "Michelangelo's Birthday"
  32. "Usagi Yojimbo"
  33. "Case of the Hot Kimono"
  34. "Usagi Come Home"
  35. "The Making of Metalhead"
  36. "Leatherhead Meets the Rat King"
  37. "The Turtle Terminator"
  38. "The Great Boldini"
  39. "The Missing Map"
  40. "The Gang's All Here"
  41. "The Grybyx"
  42. "Mister Ogg Goes to Town"
  43. "Shredderville"
  44. "Bye, Bye, Fly"
  45. "The Big Rip-Off"
  46. "The Big Break-In"
  47. "The Big Blow Out"

1987 Season1988 Season1989 Season1990 Season - 1991 Season1992 Season1992-1993 Vacation in Europe sideseason1993 Season1994 Season1995 Season1996 Season

Attack of the 50-Foot Irma is a season 3 episode of the 1987 TV series.


While preparing for Irma's birthday party, Michelangelo realizes he has forgotten to invite the guest of honor. He contacts April, who is in the midst of interviewing Professor Von Zifflin about the discovery of a meteorite that "just crashed in the area." The professor claims that this is a very unusual meteorite with a core composed of an extremely rare isotope known as "Exoboron".

The Turtles turn on their TV to watch their favorite journalist as she interviews Von Zifflin. Suddenly a noxious gas fills the room and someone steals the meteorite. Before the thief can escape, he stops in front of the news camera, revealing himself to be the Shredder. The Turtles try to stop him but Splinter stops them from going.

Shredder returns to the Technodrome and delivers the meteorite to Krang. Krang promptly sets out to "harness the power of the Exoboron isotope."

Krang successfully crystallizes the Exoboron and demonstrates to Shredder how the crystals combined with his "enlarging ray" will allow a subject to grow six times their natural size. Shredder is the first test subject. While Krang is satisfied with the less than perfect results, he decides to do more testing on Shredder above ground.

Meanwhile, April has followed Irma, who has rushed out to get something to eat. Shredder emerges through the ground in one of Krang's pneumatic modules. Via his com-link, Shredder tells Krang to send up the Exoboron Probe. Within seconds it crashes through the street directly under April. She hangs on tight to the contraption and contacts the Turtles.

Shredder becomes impatient waiting for Krang to activate the enlarging ray. Shredder implores Krang to hurry up, but because April is still hanging on to the machine, she causes it to malfunction. Irma is zapped rather than Shredder. While April and the Turtles see to Irma, Shredder and the Exoboron Probe retreat back underground.

Donatello is working hard in his lab, analyzing crystals that he found at the site of their most recent encounter with Shredder. He realizes that Irma could be in BIG trouble (pun intended). April contacts the Turtles to say a ten-foot-tall monster has kidnapped Irma... Donatello reluctantly tells April that Irma IS the ten-foot-tall monster... and she's likely to grow much larger!

The Turtles and April successfully locate the now 30-foot-tall Irma and hide her from the Federal Troops who have been ordered to capture the "giant woman." Donatello decides that in order to reverse Irma's growth he needs more Exoboron. April tells them they can get it at the Planetarium where the meteorite is safely locked away.

Posing as government officials, the Turtles convince Professor Von Zifflin to give them the other half of the meteorite for atop secret project: Operation Irma. Shredder, Bebop and Rocksteady arrive to "liberate" the rock from them, but once again they are foiled by the Turtles' expertise in martial arts. Shredder, Rocksteady and Bebop escape, but before the Turtles can pursue them, they're contacted by April. It seems that Irma has woken up and has a huge case of the "munchies" and she's heading for the city!

Donatello mixes an antidote and the Turtles search for Irma. They finally spot her, but so does the military. While laser blasts explode around them, the Turtles try to convince Irma to swallow the pill - but she refuses, telling them that when she was a little girl her mother always mixed the pill inside a bowl of ice cream. This gives Michelangelo an idea, and with the help of a cement mixer, they are able to mix the Exoboron antidote along with gallons of ice cream, thus enabling Irma to consume it before the military and Vernon, who thinks he is beating April out of an exclusive news story, arrive on the scene.

Back at the Turtles' lair, Irma celebrates her birthday by gorging on pizza. April reminds her about her diet, only to have Irma reply that she is through with diets - she just lost ten thousand pounds!





Home media releases


  • Teenage Mutant Ninja Turtles Volume 3
  • Teenage Mutant Ninja Turtles Season 3
  • Teenage Mutant Ninja Turtles Cowabunga Collection
  • Teenage Mutant Ninja Turtles: The Complete Classic Series Collection


  • Teenage Mutant Ninja Turtles Volume 2
  • Teenage Mutant Ninja Turtles Volume 3
  • Teenage Mutant Ninja Turtles Volume 7
  • Teenage Mutant Ninja Turtles Volume 9



  • When April enters the Channel 6 building's roof, her hair is colored brown.
  • When Leonardo says that he can't stop the van, he is seen with Donatello's colors.
  • When Vernon is in the Channel 6 news van, the logo is gray and not red.
  • On the Channel 6 rooftop, Raphael's belt was on backwards and the letter was missing.
  • Leonardo and Raphael were seen with opposite colors when they were on the Channel 6 building after Michelangelo set off the electric switch.
  • When Leonardo asked Donatello if he was making any progress, his mouth didn't move.
  • Irma can't be 50 or 30 feet tall (as said by Donatello), because she's taller than the (150 ft. tall) Channel 6 building.
  • When Shredder exits the module near the beginning of the episode, he sends the door flying off. However, the door can still be seen attached in the background.
  • When Leonardo tells the Turtles to save Irma from the Exoboron Ray, he and Michelangelo had switched colors.
  • Raphael used his sais to subdue the live wires but in the next scene, his sais reappear.
  • How could Irma's clothes get back to normal if the antidote she received was swallowed?


  • This is the first time Michelangelo doesn't use his nunchakus in battle.
  • Leonardo's mask and bands are colored a darker blue in certain shots.
  • In production order, this was the third episode of the third season.


Shredder: Just what the world needs, a 6-foot-tall brain!
Krang: Wrong, my dear Shredder! I plan to use the enlarging ray on you!'
Shredder: Me?! Why are you being so generous? I thought you hated me.
Krang: I do! There's always the possibility it might malfunction! (laughs)



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