When doing the Loyalty mission for Samara, you are asked to spring a trap for her evil daughter, Morinth. Make sure your Paragon/Renegade score is high enough to control the conversation with Morinth. As the scene plays out, Samara and Morinth will find themselves doing battle in which both of their lives hang in the balance. Now you have to determine which one to save! You can save Samara, and gain her loyalty, or turn on her, securing the crewmanship and the loyalty of Morinth in her place.
Also,in future DLC you will get few more characters,that will join your squad.
It is important to note that how to get Morinth has been discussed many times over and there is a general agreement that the earlier in the game you can do Samara's loyalty mission, the easier it will be to have the option to choose Morinth over Samara. Because it seems the more that you wait to do this mission, the more paragon or renegade points you will need to do so. Also, though not as much agreed upon, is that it is easier to take the paragon path to get Morinth. Canadian_Dragon 15:16, January 4, 2012 (UTC)