"Crunchy Honey-Sweetened Oat, Wheat and Corn Cereal"
The cereal pieces were shaped liked small figure-eights.
Kellogg's introduced C-3PO's one year after the 3rd film in the original Star Wars trilogy appeared in theaters.
Some boxes came with Plastic Rebel Rockets, Star Wars Sticker/Trading Cards, or Cut-out Star Wars Masks, and there was a send-away offer for Kenner Star Wars action figures.
Kellogg's also produced small, individual-serving sized boxes of C-3PO's that were available as part of a multi-pack of cereals. These small boxes are very hard to find and considered a valuable rarity among cereal box collectors.
C-3PO, the golden protocol droid from Star Wars
1986 (due to the Challenger disaster)
In commercials, the actor for the Star Wars character C-3PO, Anthony Daniels reprised his role as the famous golden protocol droid.