Captain Keyes is not the same man he used to be and he has emerged from his captivity placing vengeance above all else. He is also willing to pay any price to get it. None of this is good news for his crew or his allies since the enemy fleet is far larger than they ever imagined. Even so, the real threat to team Keyes is not the enemy fleet itself but rather the Advanced AI that is controlling it. The presence of the AI behind the scenes makes things more complicated for everyone caught up in this mess and that AI is quite capable of out thinking anyone fighting against it. It has been lurking in the background for quite a long time and it planned for this very war long ago when it wrote the original Ixan Prophecies. Using its incredible ability to predict the future the AI put the prophecies into play many years ago and so far they are proving to be quite accurate. Is this a case of the AI predicting the future or are the prophecies themselves a form of manipulation? Free will may be battling destiny in this war but no matter which side you believe in there is no denying that the prophecies have always fortold the destruction of humanity.
Now that the various races are picking sides in the galactic war nothing could be more appropriate than for humanity to start fighting with each other. Dark Tech can no longer be relied upon by the human fleet so that makes Captain Keyes and the Providence a force to be reckoned with. The Providence is bigger and more well armored than any of the newer ships in the human fleet, perhaps even the entire galaxy, and as a Supercarrier class it can carry multiple wings of fighters making it a battle group unto itself. With the support of the alien personnel that he has allowed on board Keyes is plans do what is "right" even if it means fighting against his own race. What makes it all the more complicated is that all of these events were predicted in the Ixan Prophecies and Keyes is starting to believe that those prophecies are more than just religious mumbo jumbo. While he hopes to use what the prophecies predict as a form of military intelligence to help him win this war, he is also concerned that the prophecies could be manipulating him and others into taking actions that will ultimately make them come true. Not good when those prophecies end with the downfall of humanity.
An aging starship that is the last of it's kind within a fleet of modern warships has become a sci-fi trope at this point. In the case of Supercarrier, that ship is the Providence and it is not the only trope embraced right off the bat. Captain Keyes is a veteran of the first galactic war, and loved by the public, but he is hated by the rest of the military brass and that is why he captains the Providence. He has also just been assigned a first lieutenant to serve under him as a form of punishment to go along with a demotion for not following orders. That's three tropes so far but we better stop counting or we won't get to the actual story. Humanity has ruled the galaxy since winning the first galactic war by deploying Dark Tech (lol, what could possibly go wrong there) and the other races have started to resent us for it. Dark Tech allows our modern ships to do amazing things like create their own wormholes for travel and curve ordinance after they fire it, so it is a carefully guarded secret and shared with no one. We humans view ourselves as peacekeepers and believe that we use Dark Tech for the good of everyone, but the other races don't see it that way and they have had about enough of us. This is a powder keg of a situation just waiting for a spark...