As you reach higher stages of the Main Story ... Heroes are not alone in their battle against the witch and her monsters. You can create pets for your heroes that will aid them in battle.
Or, play as one of the previously locked characters such as Darth Maul, Captain Panaka, Queen Amidala, Ki-Adi Mundi, and the Battle Droid, now available from the start! Bring a Friend in Classic Couch ...