Scene 1: Edgar, in disguise, sees his blinded father being led by a servant. Gloucester yearns to be with his son, Edgar. Edgar does not reveal himself. Gloucester requests to be led to the cliffs at Dover.
Scene 2: Edmund and Goneril arrive outside of Goneril's palace. Goneril discovers that her husband, the Duke of Albany, is displeased with his wife's actions. Goneril sends a message to Cornwall to raise more troops in their battle against the French. She kisses Edmund. Albany expresses his displeasure with Goneril (and he doesn't even know about the kissing incident). Cornwall dies from his stab wound. Goneril fears that Regan will pursue Edmund now that her husband is dead. Albany vows revenge on Edmund for betraying his father.
Scene 3: Kent, in disguise, arrives at Dover. Cordelia, the Queen of France, is in charge of the army. Kent learns of Cordelia's extreme disappointment over the treatment of her father. Lear has arrived in Dover but is ashamed of his treatment of Cordelia and does not seek her. The armies of Cornwall and Albany are on the march.
Scene 4: Cordelia orders 100 soldiers to find her father, who happens to be hiding in the weeds singing madly. The armies of Cornwall and Albany approach. Cordelia readies her troops for battle.
Scene 5: At Gloucester's castle, Regan suspects Goneril's adultery with Edmund and proclaims that she will have Edmund. She offers a reward to Oswald if he can find and kill Gloucester.
Scene 6: Edgar, in disguise, leads Gloucester, telling him they have arrived at the Cliffs of Dover. Gloucester prays for forgiveness and intends to kill himself. He falls to the ground. Edgar, now a gentleman, wakes Gloucester up and informs him that he survived his fall from the cliffs and that the gods desire him to live. Lear, wandering madly, recognizes Gloucester and forgives him for his adultery. He speaks nonsensically. Cordelia's men arrive. Lear runs away. They chase him. Oswald arrives and attempts to kill Gloucester. Edgar kills Oswald. Oswald gives Edgar letters. The letter contains Goneril's encouragement for Edgar to kill Albany so the two can be together.
Scene 7: Cordelia speaks with Kent in the French camp. Lear is brought in. He barely recognizes Cordelia. Cordelia forgives her father. Edmund is now leading Cornwall's troops.