The Earth is facing a huge problem, over population. A second planet has to be sought out for the citizens of Earth. Therefore, an expedition fleet is sent out to find a suitable planet. There are battles in this series. If all fails, Dairugger XV is used to defeat the baddies.
Kikô Kantai dairugger XV
An space exploration expedition is protected by an unique armored combat group that can combine into one giant robot when necessary.