To celebrate The 50th anniversary of Star Trek, Cryptic Studios has announced the third full expansion to Star Trek Online. Agents of Yesterday, is the name of the expansion, will allow players to create a new captain and will set them on an adventure featuring classic storylines, locations, celebrities, and era-appropriate starships. As the official press release says, in addition to the ability to create a brand new Starfleet captain the developers will introduce a new episode arc for players of every faction. Read the official announcement here to know more details on the expansion.
Here's your Star Trek Online: Agents of Yesterday trailer: