The Combine

The Combine is a multidimensional empire, originating from the Combine Overworld.

History
The origin of the Combine is still a mystery, likely lost to history.

10 Day War
In 1954, one of Black Mesa's experiments went wrong, resulting in a resonance cascade. Portals opened, creatures from Xen flooding the facility. While Black Mesa was destroyed by a thermonuclear bomb, portal storms were still all over Earth, Xenian aliens attacking locals. This gained the attention of the Combine, who sent a fleet of warships to Earth. The Combine, feeling cocky this time due to taking over countless Earths, invades New York City first. American soldiers were dazed and confused, and the island was soon under Combine control.

Gravely damaged by both the Combine and Xenian forces, the entire planet works together and creates the Combined Army. With the United State's stockpile of australium, and the recovered Xen crystals from HECU, they begin building a superweapon named the Big Mac. The allied countries of Earth began protecting Washington D.C., as the weapon was being built in the White House. WIP

They lure the Combine into Agrabah by sending a decoy ship, making fake news reports of the "last humans" staying in Agrabah. The weapon is set off when millions of the Combine stationed at the country, the sheer force of the mushroom cloud kicking the portals in the balls and closing them.

The remaining Combine forces are split up and go into hiding, the Xenian aliens becoming common pests, even being domesticated by humans.

Splinter Groups

 * Wattpadian Combine