Omega's fleet numbers in the thousands, and his impossibly large invasion force includes billions of minions. He simply cannot be stopped. The Earthers' only hope is 'the plan', an ambitious gambit devised by Supreme Consul Setter Caine in hopes of cheating the plague of total victory.
Omega can overpower any force in the universe. Even with the help of their allies, the Earthers cannot defeat him... but they are willing to die trying.