Justin Doofenshmirtz
No Screenshot 2
Gender: Male
Friends and Family
José Doofenshmirtz (father)
Fluffy Pants Doofenshmirtz (brother)
Mr. Doofenshmirtz (brother)
Gertrude's father or mother (sibling or brother's sibling-in-law)
Narthelliot's father or mother (sibling or brother's sibling-in-law)
Simpkin (sibling or brother's sibling-in-law)
Boris (sibling or brother's sibling-in-law)
Gretel Doofenshmirtz
Nephews or nieces:
Heinz Doofenshmirtz (nephew)
Roger Doofenshmirtz (nephew)
Gertrude (niece or brother's niece)
Narthelliot (niece or brother's niece)
Grand-nephew or nieces:
Vanessa Doofenshmirtz (grand-niece)
Gertrude's baby (grand-nephew/brother's niece or grand-nephew/niece
Great grandfather:
Jekyll Doofenshmirtz
Heinz Doofenshmirtz's mother
Behind the Scenes
First Appearance:
  "Phineas and Ferb Christmas Vacation!" (Mentioned only)
Voiced by:

"I didn't even create the Naughty-inator myself because I compulsively obsessively just couldn't be bothered. Now, the plans were mailed to me from Borneo where my uncle Justin is rumored to be in hiding. "
— Heinz talking about Justin[source]

Justin Doofenshmirtz is Heinz Doofenshmirtz's uncle, who is rumored to be hiding in Borneo.

Personal Life

Heinz mentions that the kit for the Naughty-Inator was sent from Borneo, where Justin is rumored to be in hiding. In actuality, the kit was sent from Barneo, implying the naughty-inator was sent by Santa Claus as part of a plan to give Heinz what he always wanted: the ability to hate Christmas.

Personality and Traits

Justin seems to share an evil ambition with his nephew, Heinz Doofenshmirtz. Heinz Doofenshmirtz got a package from Barneo, but he thought it said Borneo, where Justin is rumored to be. Since Justin's location is rumor and he is likely on the run, Justin may be better with his evil ambitions than his nephew, since being on the run means the local authorities are after him, although not enough to make consistent clean getaways.

Skills and Abilities

He seems to have an ability to make evil machines, or "inators", like his nephew.


Background Information

  • At the DVD commentary for Attack of the 50 Foot Sister, it was stated they originally wanted to use Justin for the smell reference but the producers didn't understand the analogy, so they went with dirty diapers instead.


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