Katie Ka-Boom
Katie Kaboom.jpg
Full Name Katie Ka-Boom
Segment Katie Ka-Boom
First Episode Katie Ka-Boo
Voice Actor Laura Mooney
Catchphrases I'm not overreacting, I'm a teenager!

I'm not overreacting, I'm a teenager! - Katie Ka-Boom

Katie Ka-Boom is a 16-year-old teenage girl who greatly overreacts to trivially upsetting situations and literally turns into a flaming monster before subsequently exploding, usually leaving the family home in ruins. She's voiced by Laura Mooney.


Being a typical teenage girl, she‘s very overreactive and emotionally difficult. When she‘s her normal self, she’s actually a very cute, beautiful, lovely, innocent and nice girl. Though when she goes "ka-boom" (hence her last name) she turns into any destructive monster, literally. 


In human form, Katie is a teenage American female. She appears to be 16 years old and has a blonde bob hairstyle. She has a pastel blue sweater that exposes her shoulders, pink jeggings and blue flats. She also wears a red lipstick.

Katie changing

Before she changes into a monster her eyes glow bright white, her voice gets very deep and she grows. In monster form she seems to be able to change into different forms. As one monster she looks like a green monster and her clothes are ragged, but she has also been seen as a fiery monster. More often than not, the transformation is related to the upsetting situation, such as a giant telephone monster when she loses a call, a Big Daddy Roth-esque hotrod monster during a driving lesson, and a beast in a dress for when arguing about Katie's curfew for staying out late during prom night. However, after she explodes, she’s fine and her clothes are unaffected while the rest of her family and nearby surrounding is completely ruined.

Katie doesn't seem to be aware of her exploding and turning into a monster after she has blown up, but she might just not come on it. During her transformation she will deny her families statements that she‘s a monster, saying "I'm not overreacting, I'm a teenager!". She may have her transformation under control in the revival, however, as she quickly turned into her monster form to chase after Chicken Boo after he captured her along with the rest of the Animaniacs cast.

Katie in her monster form from "Katie Ka-Boo" and "Good Warner Hunting"

Theme song

She's Katie Ka-Boom, Katie Ka-Boom.
She lives in a house with a garden in bloom.
Her family knows that anytime soon,
Their little lady Katie goes ka-boom!

List of Katie Ka-Boom cartoons

Other appearances




Katie's dad and mom with little brother, Tinker.


  • Katie is a parody of She-Hulk.
  • Katie made three cameo appearances in the series.
    • She appeared in one scene as a green alien looking monster in "The Big Wrap Party Tonight" when Yakko mention some characters names.
    • She (in human form) appeared in one part in the beginning of “The Scoring Session" where Katie is among one of the characters part of the orchestra. When the sub named Neivel Nosenest came, Katie wasn’t seen in the orchestra pit afterwards.
  • Nicholas Hollander based Katie on his own teenage stepdaughter who would often explode at every little thing that went wrong.
  • A lookalike of Katie Ka-Boom appeared in the series finale of The Sylvester and Tweety Mysteries.


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