Oberon, king of the fairies, who lives in the woods, has quarreled with his queen, Titania, over an Indian boy she refuses to give him.
Oberon overhears Helena and Demetrius arguing and sends his mischievous servant, Puck, to get a flower whose juice has the power to make people fall in love with the first creature they see when the juice is placed on their eyelids while asleep.
He instructs Puck to put some drops on Demetrius's eyes. Mistaking the Athenian he seek, Puck puts the flower juice on the eyes of the sleeping Lysander.
So that when he is woken by Helena he immediately falls in love with her and rejects Hermia.
Some artisans are rehearsing a play about the tragic love-story of Pyramus and Thisbe to present before Theseus on his wedding day.
Bottom, the weaver, is to play the lover, Pyramus, while Flute, the bellows-mender, is to play Thisbe. The others play the parts of the Moon, the Wall and the Lion and they are directed by Quince, the carpenter.