Katty was introduced in the episode, "Sonic's Song" from the cartoon Adventures of Sonic the Hedgehog.
Katty wrote and sang a song about Sonic freeing Mobius that angered Dr. Robotnik so much he sent his henchbots, Scratch and Hounder to kidnap her. Sonic and his pal Tails rescue Katty.
Then Robotnik sends a music-hating robot to attack anyone playing music. A baby playing a toy drum walks in front of the robot. Katty pushes the baby out of the way saving it. Unfortunately, the robot grabs her and takes her to Robotnik.
He then tries to force Katty to create a song for him. He even makes her learn how to play an accordion which she doesn't know how to play.
Sonic and Tails save her from Robotnik and they walk off together while she sings Sonic's song and plays her guitar.