The phrase "intergalactic conflict" refers to a war or battle that takes place between different galaxies in outer space. It signifies a clash or disagreement between civilizations or species from different galaxies. Full definition
Yes, oh fellow Impulse Gamers those alien races are coming back for some more intergalactic conflict. (impulsegamer.com)
The best part about games set during a massive intergalactic conflict, like Mass Effect, is that there is so much going on at all times. (gamerassaultweekly.com)
Finally, Blizzard delivers a story that reminds us of the good old times, full of intrigue, pain and intergalactic conflict, wrapped up in Starcraft's greatest gameplay iteration to date. (metacritic.com)