He holds the record for the most grand slam homeruns by a catcher, at 10. He was also the first individual baseball player to appear on the front of a Wheaties box. (edited at 8:21 am, July 18, 2017 (PDT))
Original question: He holds the record for the most grand slam homeruns by a catcher, at 10. He was also the first individual baseball player to appear on a Wheaties box.
Johnny Bench (Originally this question did not specify that he was the first individual player to appear on the "front" of a Wheaties box. As LorinBurte pointed out, Lou Gehrig was the first athlete on a Wheaties box. But he was on the back. And he wasn't a catcher.) (edited at 8:29 am, July 18, 2017 (PDT))
Original Answer: Johnny Bench