Unknown Worlds 26 September 2015, Pepino A4 (29,7 x 21,0 cm) Felt-tip pen, pencil, color pencil, ballpoint pen and stickers on letter-head paper i Unknown Worlds was an American pulp fantasy fiction magazine, published from 1939 to 1943. The figures are Kellogg's cereals' Tony the Tiger and Sanrio's Hello Kitty. Tags: Japan, Tony, tiger, Hello, Kitty, cereals, unknown 87 / 779