Humanity has opened the doors to the stars, other dimensions and even time. And from all of these new frontiers evil rises to attack us

The Imperial forces of Emperor Cole, the Rikti Invasion fleet, the Nictus Forces and even time travelers are threatening to invade our world. In Paragon City, the nexus of these invasions, the brave soldiers of the Vanguard have stood against these attacks, sometimes supported by heroes and even supervillains if the mood struck them. Knowing that heroes taking time of their schedules and villains following their own interests would never be enough to protect all of humanity the Lady Grey asked the United Nations for help to stand against these threats that would spread from Paragon all over the planet. To answer her call they have assembled a team of the most powerful and talented individuals to protect Earth from attack and invasion. No matter where, when a threat arises the mighty carrier-ship Valiant descends, releasing the superheroes and soldiers of the Freedom-Alliance each one sworn to guard humanity from evil and dedicated to the highest ideals of justice.