Uncle Justin

"I didn't even create the naughty-inator myself because I compulsifly obsessibly just couldn't be bothered. Now, the plans were mailed to me from Bornio where my uncle Justin is rumoured to be in hiding."

- Heinz talking about Justin in "Phineas and Ferb Christmas Vacation!"

Justin Doofenshmirtz is Heinz Doofenshmirtz's uncle, who was mentioned in Phineas and Ferb Christmas Vacation!. He gave Heinz the kit to make the naughty-inator.

Personal life
In Phineas and Ferb Christmas Vacation!, Heinz mentions that the plans for the naughty-inator was sent from his uncle Justin, who is rumoured to be in hiding, which possibly makes him on the run from the authorities.

Family
Uncle to Heinz Doofenshmirtz.

Catch phrases

 * catch phrase #1

Memorable quotes

 * "quote #1"

Appearances

 * Phineas and Ferb Christmas Vacation! (mentioned)