Theseus met Periphetes after reaching Epidaurus. Periphetes had one eye like a Cyclops and lame in one leg and used to rob and kill the travelers with his bronze club. Theseus tricked Periphetes to ensure that his club was really made of bronze club and hit him on the head with it and killed him.
Labour 4: Sciron
Sinis killed travelers by tying them to two trees and bending them to the ground. The victim was torn apart. Theseus killed Sinis by using the same method, he tied Sinis to two trees and used the momentum of the trees to bend him to the ground. When Sinis was killed, Perigune, Sinis’ daughter, fled into the forest. Theseus searched her everywhere with a promise not to injure her and respect her.
Labour 5: Cerycon
Crommyon was terrorized by a monstrous wild pig called the Crommyonian Sow. It belonged to the Phaea, who was an old witch. Theseus killed the Crommyonian Sow and its mistress as soon as he arrived in Crommyon.
Labour 6: Procrustes
The Sciron would kill travellers that were passing through these rocks by forcing them to wash their feet and then kicking them over the cliff. Theseus tricked Sciron by telling him to wash his feet then Theseus kicked him over the cliff.
Cercyon was a strong man who challenged those passing through his lands to a wrestling match. The losers were killed, but there were never any winners. Theseus defeated the king skillfully instead of using his physical power and captured his kingdom after killing him.
Procrustes controlled the path between Athens and Eleusis on Mount Korydallos. He invited all those who traveled his way to help him with a blacksmithing task, which often resulted in the deaths of those who tried to help. Theseus beheaded him along with cutting his legs with his own axe.