Gamilas are a hibe-minded bipedal species which developed an advanced space faring civilisation.Knowning their planet doomed, they tried to invade Earth around 2199 and eradicate humankind. This decision caused a split of the hive personnality, one portion of it being against destroying another species. It sent technological information to Earth that would allow the humans to defend themselves. The Gamilas were eradicated.
Source: Space Battleship Yamato live action.