Doonesbury by Garry Trudeau for October 02, 1972
Mike: How was your summer, Rufus? Rufus: Mike, my name isn't "Rufus" any more. I'm back with "Thor". Mike: "Thor"? Man, I can't figure that one out. What could you possibly have in common with a blond norse god? Rufus: What a dumb question! Strength, courage stamina, valor interpidity, mettle, pluck and grit, obviously! Mike: Oh, I see the parallels now. Rufus: I should hope so.