Duckman: Private Dick/Family Man - Season 4 Episode 18

Duckman needs a new kidney in order to survive, but his only living relatives are not suitable donors. When Duckman thaws out his cryogenically-frozen father, the kidney does not match: his father is not his father! Duckman finds his biological father, who turns out to be a loony militia-man. Still, father and son bond and the old man is touched by Duckman. Thus, he cuts out his own kidney and gives it to him. James Brown guest voices as himself offering Duckman some soulful advice, along with Brian Keith and John Astin.