|Relatives||*Peggy Hill (daughter)|
|First appearance||A Rover Runs Through It|
|Voiced by||Mike Judge, Harrison Ford|
Doc Platter is 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 being alive and a wise old cowboy who mainly spoke in seemingly nonsensical phrases which Hank found inspiring.
- Season 9