Dr. Cluckingsworth M.D. looks like an ordinary chicken but she has an oversized brain with green veins bulging from her head.
In "Race with the Demon", Dr. Cluckingsworth M.D. was still an ordinary chicken until she drank the mutagenic fuel sample that came from Speed Demon in Donnie's lab-barn. The mutation enlarged her brain, giving her remarkable intelligence and the ability to lay radioactive mutagen eggs. She acts as Casey's co-pilot as he races against Speed Demon.
In Return to New York, Donatello shares a goodbye towards Dr. Cluckingsworth as the Turtles leave the farm to retake New York from the Kraang.
Friends & Allies
- Donatello - Dr. Cluckingsworth considers Donatello her closest friend as of "Return to New York", when he sadly bids her goodbye, hoping to see her again someday. They first met in "Race with the Demon", when Donnie briefly scolds Michelangelo for allowing the chickens to come in without his permission.
- Michelangelo - She was Michelangelo's pet chicken until "Race with the Demon", when she accidentally drinks the spilled mutagen oil that Donatello collected from the road. They are close friends, as Mikey did take care of her throughout his stay at the farmhouse. He also named her Dr. Cluckingsworth, M.D. immediately after her mutation.
- Casey Jones - At first, Casey was annoyed that there was yet another mutant in his life, sarcastically remarking that it was "just what [he] needed". By the time they race against Speed Demon and save Donatello, they immediately get along and become close friends.
- April O'Neil - April and Dr. Cluckingsworth don't interact much during the series, but she does help Donnie test April's psychic powers with his latest invention ("Eyes of the Chimera"). She considers April an ally as of "Race with the Demon".
- Leonardo - Dr. Cluckingsworth considers Leonardo an ally as of "Race with the Demon".
- Raphael - Dr. Cluckingsworth also considers Raphael an ally as of "Race with the Demon".
- Speed Demon - She helps Casey race against him in "Race with the Demon", succesfully defeating him in the end and celebrating her victory along with Casey and Donatello.
- The Turtle Racer toy version, a.k.a. Turtle Hot Rod, has a miniature Dr. Cluckingsworth M.D. molded inside the little cage on its back.
- The cage that Dr. Cluckingsworth M.D. sits in bears a slight resemblance to R2-D2 from Star Wars.
- This is notable in that the R2 units from the Star Wars franchise serve as a fighter Pilot's assisted A.I. inside of their individual ships. Dr. Cluckingsworth M.D. serves as the Turtle Racer's A.I. and communicates with Casey via a WI-FI link from a laptop to an old Speak & Spell toy from Texas Instruments.
- She is last seen in "Return to New York", after sharing a goodbye hug with Donatello.