Poetic Injustice is the second part of the 13rd aired and 12nd produced episode in the fourth and final season of Dexter's Laboratory. It first aired on November 20, 2003. In this episode, Dexter meets a girl named Mary Weather and tries to win her heart.
Dexter gets on the bus and sees a girl there named Mary Weather. He is in love with her but he doesn't have the courage to talk to her. He sits behind her on the bus and her hair blows in her face. He goes to and back from school and when he gets off the bus, Dee Dee says that she doesn't even know he exists. She says that she can help him but he ignores her.
The next day he talks to her himself. He tells her about how he dissected a goat in his lab and she smacks him up against the window. Then, he decides to change his mind and he asks Dee Dee to help him. Dee Dee tells him that if he wants her to fall in love with him, then he should use poetry. Dexter tells her that he can't write poetry. Dee Dee says that she can help with that because she knows how to write poetry.
Dee Dee gives Dexter a romantic poem and he reads it to her the next day. Mary Weather falls in love with him and the bus flies. Dee Dee keeps giving Dexter poems and Dexter keeps reading them. Then, Dexter starts saying insulting poems about Dee Dee. Dee Dee gets mad and gives Dexter a horrible evil poem. Dexter reads it and Mary Weather falls out of love with him and smacks him up against the window again and Dexter loses his relationship with Mary Weather and sadly goes home.
Although though most episodes premiered on Fridays, this episode (along with "They Got Chops" and "Comedy of Feathers") premiered on a Thursday, as part of Cartoon Network's "November Premieres" block, where a new episode of a Cartoon Cartoon would premiere on a random weekday throughout the month.