Theseus, you are to go to Athens and talk to your father — Aegeus, King of Athens
On the way to Athens, Thesus faced a number of enemies: a wild boar with giant tusks; Procrustes, a sadistic innkeeper; and a giant named Sinis who enjoyed ripping his victims apart.
Eventually, Theseus made it to Athens and spoke with his father, King Aegeus. Aegeus informed everyone that Theseus was his son and heir to the throne.
Theseus's cousins were jealous, so they attacked him. Theseus defended himself and killed them. The Athenians, outraged, chose Theseus to be sent into the Minotaur's Labyrinth as one of the fourteen children to be sacrificed.
In the labyrinth, Theseus tried to think of a way to defeat the Minotaur. A princess named Ariadne approached him and said he could kill the minotaur while it was asleep, and her magic ball of thread could guide him so he wouldn't get lost in the labyrinth.
At midnight, while the Minotaur was asleep, Theseus snuck into the center of the Labyrinth (where the Minotaur slept) and killed it quickly. He then followed Ariadne's magic thread back to the entrance of the labyrinth where Ariadne and all the other children were waiting and escaped the Labyrinth.