Egeus doesn't approve of Hermia and Lysander wanting to marry wach other, and reminds her about Demetrius going to marry her.
Helena tells Demetrius about Hermia and Lysander's plan to run away together.
Titania and Oberon argue about who gets to keep the little Indian boy, which causes Oberon to give Titania a love potion to fall in love with a beast, so he could get the child.
Puck gives Lysander then Demtrius a love potion so they will both fall in love with Helena, leaving Hermia alone in the woods
Puck leads everybody away from each other, so no one would get hurt or killed. The love potion is then taken away by Lysander so he will love Hermia again.
Lysander, Hermia, Helena and Demetrius are woken in the woods by Egeus, The king and the queen. They are then escorted back to the palace where Helena and Demetrius got married as well as Hermia and Lysander.