In a desperate attempt to win his freedom, the slave, Pseudolus, attempts to help his young master, Hero, earn the love of a courtesan, Philia. Meanwhile, Pseudolus has to outsmart Hero's parents, the slave-master, Lycus, and the large man that has already paid for Philia, Miles Gloriosus. Also, an old man Erronious is desperately searching for his lost children. In the end, it turns out that Philia and Miles are brother and sister and the children of Erronious. Further, Philia is now allowed to marry Hero and Pseudolus gains his freedom.