Join Starfleet and defend the Alpha Quadrant in Star Trek Online! Federation captains can choose from a wide variety of species including Humans, Vulcans, Andorians and Bajorans or even create your own. As a member of Starfleet, Federation players will be able to choose one of three career tracks and have access to a wide variety of starships ranging from the classics of the 23rd century to the newest ships being created by the Starfleet Corps of Engineers. Customize the appearance, weapons and equipment on your ship to fit your playstyle!

Federation captains will experience a wide variety of gameplay, from Episodes that mirror the experience of the television series as they tell the story of Star Trek Online to quick combat events that will challenge your skills as a ship's captain.

But that's not all you can do! Go to the Defera Invasion zone and challenge the Borg for control of the planet. Challenge the warriors of the Klingon Empire in PvP combat. Visit iconic locations such as Starfleet Academy, Vulcan and Bajor, or control you crew and gain rewards with the Duty Officer system. Or create your own stories in the Foundry and share them with other players.

It's your ship. Your crew. Your choice.

The Federation and Klingon Empire are at war, and more soldiers are needed to push Starfleet out of the disputed Eta Eridani Sector Block and win glory for the Empire!

Klingon Empire characters can choose from a variety of species including Klingon, Gorn, Orion and more. As a member of the Klingon Defense Force, these characters can choose between three career tracks and fly starships built for combat, from the mighty Bortas flagship to carriers that launch waves of fighters or birds-of-prey to assault your foes.

Complete with a brand-new tutorial and brand-new missions, Klingons now have full leveling progression, starting the game at level 1 and playing episodes, missions and events all the way to level 50.

Visit Qo'noS. Earn rewards through the Duty Officer system. Fight the Borg or push back the forces of the Terran Empire. Create your own stories and share them in the Foundry. Confront the Dominion and show the Tholians who really controls the Alpha Quadrant!

Romulus and Remus are gone. You are one of the survivors, struggling to survive in the aftermath of unspeakable destruction.

These are dark and dangerous times for your people, as the Tal Shiar crack down on any dissent and mysterious beings unleash terror throughout the far-flung colony worlds.

You will be the one to reshape an empire. Gather allies, go undercover and find the proof that will rally your people to revolt.

Together, you will rise up against an oppressive regime and demand freedom. You will fight for your people.

You are the Legacy of Romulus.

After its defeats at the Battle of Sector 001 and in the Delta Quadrant, the Collective retreated far from Federation space. There they watched and adapted. They became faster, stronger and more aggressive. They waited for the right time to strike.

The Borg have returned. What they can't assimilate, they will destroy.

After the attack at Vega Colony that starts Star Trek Online for Federation players, many players will have limited contact with the Collective until the later levels. But then, not only will you have to square off against the Borg; you'll also have to contend with other factions attempting to utilize Borg technology for their own ends. You may even find yourself making friends with enemies to combat the threat of the Collective.

Experienced players will battle on planets already conquered by the Borg as well as fighting them in the streets of Defera in an attempt to save that beleaguered planet from assimilation. You may even join with other players to tackle Special Task Forces, which are team missions designed to challenge even the most skilled ship commanders.

The Romulan Star Empire shattered with the destruction of its home system. Decades later, it is emerging from the darkness and seeking revenge.

Federation players will have an entire arc in Romulan space where they can participate in counter-espionage, make sneak attacks to head off a larger conflict, discover the secrets behind the explosion that destroyed the Romulus system and deal with the mysterious Devidians. Also lurking in Romulan space are the Hirogen, hunters from the Delta Quadrant who have travelled across the galaxy in search of new prey.

Romulan Republic players will play a game of political cat-and-mouse as they delve deeper into the intrigue surrounding the destruction of Romulus and fight for their freedom and people. As empress, Sela will not tolerate any dissent against her rule. She has openly denounced the Romulan Republic, saying that the movement to break away from the empire and create a new Romulan homeworld is a terrorist action. She is using the full force of the Tal Shiar to hunt the leaders of the Romulan Republic and will not stop until their organization is eliminated.

Federation, Klingon Empire, and Romulan Republic players can experience "Cloaked Intentions," a Featured Episode series that pits you against a crazed Tal Shiar operative bent on serving his hidden masters. Will you join the Reman Resistance ... or try to block their path to independence?

The area around Deep Space Nine has always been a hotbed of conflict, and it's no different in 2409. After the devastation of the Dominion War, the majority of the Cardassian people chose to reshape their world as a democracy allied with the Federation.

Not everyone agreed with this new direction. The True Way, an organization dedicated to expelling all non-Cardassians from Cardassian space and restoring the "true way" of conquest and oppression, has launched a campaign of terror throughout the region. Even Deep Space Nine isn't safe from their attacks.

Federation players will be at the heart of the conflict as they attempt to stop the attacks and prevent the True Way from gaining new allies and sparking another war.

At the end of the war, most Dominion forces withdrew back to the Gamma Quadrant. Only the Alpha Jem'Hadar, a fighting force created in the Alpha Quadrant, was left behind to find its own way.

Free from the influence of the Dominion, these Jem'Hadar will be seeking new alliances and new gods. This quest will bring them into conflict with the Federation – after all, if victory is life, what is peace?

In addition, "The 2800" Featured Series answers a decades-old mystery – what happened to the Dominion fleet that disappeared in "Sacrifice of Angels"? When these old foes return intent on completing their mission, the Starfleet and the KDF will be forced to set aside their differences and confront a threat from the past!

You’ll meet the Undine early in your travels, but that meeting definitely will not be the last.

The enigmatic species from fluidic space, formerly known by their Borg designation as Species 8472, have infiltrated all of the powers of the Alpha Quadrant. Discovering Undine in disguise and uncovering the reasons behind their campaign is one of the continuing stories in Star Trek Online.