Exclusive Details

Two all beef patties, special sauce, lettuce, cheese, pickles, onions, and one man having a seizure -- that's what wrestling star Vampiro encountered at a McDonald's ... and he ended up saving the guy's life.

The "Lucha Underground" announcer saw a man convulsing on the ground at a McDonald's in Ontario and called 911. While he was waiting, Vampiro says he rushed in to help the elderly man with basic first aid techniques ... then waited with him for first responders to arrive.

The man eventually came around once paramedics treated him.