Warning there will be explosive, deaths, bad words, and other things are not suitable to children so be warned and it's not cannon. Y/n freeman a scientist in black Mesa was then given a deal with Gman. He told him that another army of aliens named Combine was invading his home world. In order to defeat the Combines Y/n mist gather any heroes and weapons if he is able to destroy them. But it will take Y/n to go world to world if he can save his home world.