|Relatives||Peggy Hill (daughter) Hoyt Platter (son) Hank Hill (son-in-law) Maddy Platter (wife) Bobby Hill (maternal grandson) Luanne Platter (paternal granddaughter) Gracie Kleinschmidt (great-granddaughter)|
|First appearance||A Rover Runs Through It|
Doc Platter was Peggy's and Hoyt's father, Maddy's husband, Bobby's maternal grandfather, Luanne's paternal grandfather, and Gracie's great-grandfather. In earlier episodes, Doc was implied to be deceased as he was never seen or mentioned. In A Rover Runs Through It, Doc was depicted as a wise old cowboy who mainly spoke in seemingly nonsensical phrases which Hank found inspiring.
- Season 9