Age of Tomorrow (2014) on Netflix

Plot summary

The UFOs that reach Earth are hostile, and they set out to destroy the planet while the people of the world fight to survive. As the battle continues, astronauts make their way aboard the alien mothership, and there they find a gateway that opens onto the aliens' home world. Their warning is what tells Earth the gateway exists. With the invasion still going, the planet has one option left, which is to send fighters through the gateway. An elite group of science and combat specialists goes through. The team's task is to stop the invasion from inside the aliens' own territory, at its source.