Hermia and Lysander love each other both but Demitrius also loves Hermia. Hermia's father Egeus wants his daughter to marry Demitrius and gets Athenian law to force her to marry Demitrius, givnig her the idea to run away with Lysamder
Titania and Oberon, the King and Queen of fairy's are in a depute over a boy Titania had adopted and in out of anger makes Oberon get Puck, his servant, to put a love potion in Titania's eyes while sleeping.
Helena and Demitrius go to the woods as well, looking for Hermia and Lysander where Oberon hears Demitrius's insults on Helena and takes pity on her by commanding Puck to cast a love potion on Demitrius to fall in love with Helena but ends up with Puck accidently giving the love potion to Lysander, making him in love with Helena.
Meanwhile, Craftsman make their way into the forest to rehearse their play of Pyramis and Thisbe
During the rehersal of the play, Bottom leaves the "stage" and heads further alone in the woods where a spell is cast on him of giving him the head of a donkey and at the same time is the first face Titania see's and triggers the potion to fall in love with Bottom.
Oberon Realizes the mess that was created and decided to reverse all his doings, ending the nightmare and leaving all the humans waking up to what seemed a peculiar dream.