Gatchan plays with it in "The Biggest Bye'cha of All: Part Two" and turns Senbei giant, which allows him to inadvertently scare off alien invaders who came to take over the Earth. Arale and Gatchan play with the Big-Small Ray Gun in "Mammoth Midori: Part 1." Dr. Goat then uses the gun on Senbei, Arale, and Gatchan in "Mammoth Midori: Part 2" to dislodge a deadly mosquito from Midori Yamabuki's body.