Plot: Super Robot Spirits is a 3D versus fighting game for the Nintendo 64, based within the Super Robot Wars line of games. It was released only in Japan in 1998. Wikipedia
Plot: Chee-Chai Alien is a video game developed by Creatures, Inc. and released on the Game Boy Color in Japan on February 27, 2001. It utilizes the Game Boy Color's infrared port and has a built-in rumble feature. It is compatible with the Game Boy Printer. Wikipedia