They'r G-R-R-REAT!

Says Tony the Tiger in this 1953 magazine ad for what was then known as Kellogg's Sugar Frosted Flakes.

 

Clark and Tony

Here's a commercial for Kellogg's Sugar Frosted Flakes that first aired on the old syndicated Adventures of Superman television show as Clark Kent (George Reeves) looks in on an argument between two kids, the Superman way, of course. Tony the Tiger's in this one, too.