Egeus wants his daughter Hermia to marry Demetrius. hermia does not want to marry Demetrius because she loves Lysander.
Lysander and Hermia run away from Athens. Demetrius follows to try and find Hermia. Helena follows demetrius hoping that he will be grateful of her company.
Oberon and Titania fight over the Indian boy. They go their seperate ways because they are angry at eachother.
Oberon orders Puck to apply the love potion to Titania's eyes. Puck also accidentally applies the potion to Lysander's eyes which makes him fall in love with Helena. Puck tries to fix the problem by applying the potion to Demtrius' eyes aswell but this just makes him fall in love with Helena aswell.
Under the influence of the love potion Titania falls in love with Bottom who has the head of a donkey.
Puck fixes the problem that he created by making Demtrius fall in love with Helena and Lysander fall in love with Hermia. The two couples go back to Athens to get married. Oberon gets Titania out of the love spell and makes her fall back in love with him.