In the year 2162, a tiger cub named Koga was transported to Earth from another dimension. Originally thought to be a normal tiger cub, he was brought up on an endangered animal reserve. Eventually he starts talking, and walking on 2 feet. In 2170, the Earth is attacked by an alien weapon that has the power to destroy countries...Koga is now fully matured and decides to join the Space Force to protect the ones he loves. In 2172, they travel to the alien world to destroy it.