On March 13, 2012, the third episode, The Battle for Earth, was released. This episode largely continued the story in the fight against Brainiac which was one of the main storylines in the DC Universe Online base game. Players would fight for the fate of the universe with cooperative gameplay against Braniac. Some of the key features of this episode include three Tier 2 Duos in Riverfront Center, Gotham Hospital, and Riverside Hotel, one Tier 3 Alert in South Gotham Courthouse, and two Tier 4 Raids in the Gates of Tartarus and The Prime Battleground. In addition, the new Tank power, "Earth" was added in and the Battle For South Gotham featured daily Tier 2 missions