Two years after a devastating alien invasion on Earth, the remnants of humanity are engaged in a relentless struggle for survival. In the heart of an embattled Australia, a group of resistance fighters, led by military veteran Matt Simmons and his partner Amanda, search for a way to rally the human forces against the technologically superior extraterrestrial oppressors. The aliens, known as the Greys, have decimated much of Earth's defenses and enforced strict control over remaining resources. Amidst this chaos, Matt and Amanda join an underground resistance movement characterized by its diverse members, tension-filled dynamics, and driven by a single shared goal: reclaiming Earth from its invaders.

As tensions rise between the humans and their alien adversaries, the resistance uncovers information about a possible turning point in the war—a secretive project known only as "Rainfall." Desperate to survive and strike back, Matt and his team undertake a perilous journey beyond enemy lines to gather intelligence that could change the fate of their battle against subjugation. Alongside internal challenges and external threats lurking at every turn, they must navigate unexpected alliances and betrayal while deciphering the true intentions behind Rainfall. The ever-present threat of complete annihilation looms over humanity, forcing Matt and his fellow fighters to confront moral dilemmas about sacrifice, loyalty, and what it truly means to resist when the stakes are impossibly high.