Rich Man, Poor Man (1976)

S6E8 McStroke

Peter opts to grow a mustache and, after being confused for a firefighter, steps in to help when a fire erupts at a nearby fast food joint. Grateful, the restaurant owner rewards him with a lifetime supply of burgers, but Peter overindulges and suffers a stroke. Once he heals, he pledges to reveal the truth about the fast-food industry and finds an unlikely ally in a genetically modified cow during his quest.