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Official Site: The CW

Joanna Beth "Jo" Harvelle is a fictional character on The CW Television Network's drama/horror television series Supernatural portrayed by Alona Tal. She was introduced in the second season in order to explore a mother-daughter relationship in the hunting world. Series creator Eric Kripke described her as an "innocent girl who wanted to be a hunter". Jo Harvelle was originally intended to serve as a love interest for lead character Dean Winchester, but instead turned into a sister-like figure for him. She was ultimately removed from the series by the end of the second season—Kripke admitted the conception of the character was flawed from the beginning—but returned in the fifth season. While critical reaction to Jo Harvelle was mixed, many fans disliked the character.

Jo Harvelle first meets Sam and Dean Winchester in the second season episode "Everybody Loves a Clown". The brothers look for her mother Ellen at Harvelle's Roadhouse—a saloon frequented by hunters—after she leaves a voice mail message on the phone of their deceased father, John Winchester. Throughout the second season, Jo appears to have romantic feelings for Dean, and, though he states that he also has feelings for her, he will not act on them. which strains Jo's friendship with Sam and Dean. A demon possessing Sam later sows more dissent by claiming that John actually killed her father "to put him out of his misery" after he incurred fatal wounds, despite her father's pleas to see his wife and daughter one more time. Dean rescues Jo from the demon, and she then attempts to follow Dean in the search for Sam. However, Dean refuses to allow her to come. Dean tells Jo he will call her, but as he leaves, Jo quietly whispers, "No, you won't".

In the fifth season episode "Good God, Y'All!", Jo reappears with her mother Ellen in a small Colorado town called River Pass. They plan to help Rufus, a demon hunter and one of Bobby's friends, kill the demons that have laid siege to the town. However, Jo and Ellen are separated in the chaos. Jo later finds and joins up with Rufus and other townspeople. Eventually, they attack Sam and Ellen, both of them appearing to be possessed by demons. Jo joins in with Rufus to torture the supposed "demon" out of a captured Sam with holy water and salt, but becomes doubtful when no demonic effects are present on Sam. Dean and Ellen arrive and, after a brief struggle, convince Jo and Rufus that War, one of the Four Horsemen of the Apocalypse, is responsible for making all the townspeople turn against each other by thinking that both sides are demons.

Jo and Ellen once again team up with the Winchesters in "Abandon All Hope...", where they help the brothers reacquire the Colt — a mystical gun rumored to be capable of killing anything — in order to kill Lucifer. Upon tracking his location to an abandoned town, they are confronted by the demonic Meg, who sends hellhounds after them. The hunters seek refuge in a supplies store, but Jo is mauled by a hellhound in the process. Dying, she suggests that they build bombs of salt and iron nails; using herself as bait, she can kill the creatures, allowing the rest of them to escape from the roof. Reluctantly, the Winchesters and her mother agree. Once the bombs are set in place, Dean says his farewells, and kisses her on her forehead and lips. Ellen, unable to leave her daughter's side, stays behind to unbar the doors knowing Jo would not be able to. However, Jo dies before the hellhounds enter, so Ellen detonates the bombs for her, destroying the store and killing the hellhounds.

Jo Harvelle has not been a contender in any CBUB matches.