Doctor Princess

Princess Doctor is a medical official of Ooo, as well as a princess, originally appearing in "The Chamber of Frozen Blades." Princess Doctor has a fairly calm demeanor, as she showed no fear or anger after the Ice King abducted her.

In "The Chamber of Frozen Blades," Princess Doctor performs a checkup on Gunter at the Rock People's hospital. The Ice King kidnaps her by stuffing her into his gym bag and taking her back to his castle, but she is immediately rescued by Finn and Jake.

Princess Doctor appears again near the end of "Mortal Recoil," assisting Dr. Ice Cream and Nurse Poundcake in reassembling Princess Bubblegum after she was shattered.

Ice King used her heart and intestines in "Princess Monster Wife."

In the episode "Princess Cookie," Princess Doctor appears to be working in the Candy Kingdom Mental Hospital and she points out Baby-Snaps to Jake.

Appearance and disguise
She wears tinted glasses, a red-jewel pendant over her forehead, a pair of low-heel brown shoes, and a doctor coat with an orange, long-sleeved turtleneck dress underneath. She has greenish skin with a few freckles on her cheeks, and her brown hair is in pigtails. She has a small pink Scientific Parasite in her left pocket, much like the one Dr. Ice Cream has.

Science Whyzard
Science Whyzard, a potential contestant of the Wizard Battle, was confirmed by Andy Ristaino to be Princess Doctor in disguise. As Science Whyzard, she approaches the arena carrying scientific paraphernalia such as a microscope and an erlenmeyer flask. She was turned away from the competition when the Grand Master Wizard declared, "No science."

Quotes
"Don't worry, sir. I specialize in treating little, tuxedo-people."

"Whoa nelly! Something... medical is happening!"

"I'll field that one. The Ice King abducted me while I was distracted by the horrifying beauty of birth."

Trivia

 * She is Pendleton Ward's favorite doctor.
 * Pen Ward and Rebecca Sugar have stated specifically that Betty and Princess Doctor are the same person.