<Li> "The Brothers Jones" </Li> <Li> "Dark Waters" </Li> <P> Captain Killian "Hook" Jones is a fictional character in ABC's television series Once Upon a Time . He is portrayed by Irish actor / musician Colin O'Donoghue, who became a series regular in the second season after making recurring appearances and has become a fan favorite since his debut . He is based on the character from J.M. Barrie's play, Peter and Wendy . </P> <P> In the Enchanted Forest, Killian Jones is the younger brother of Liam Jones . As children, their father abandoned them and sold them into servitude to Captain Silver . However, with the help of the god Hades, the two escape servitude and become crew members of the Jewel of the Realm . In service to a corrupt king, the two were sent to Neverland to retrieve a certain plant called dreamshade . Killian is reluctant to follow orders after Peter Pan informs them it is poisonous . A stubborn Liam is ultimately killed by the plant . Devastated by his brother's death, Jones grew bitter, blaming the king for his brother's death . Rechristening the vessel the Jolly Roger, Jones became a ruthless pirate . Some time after, he seduces away the wife of Rumplestiltskin, Milah . When Rumplestiltskin tries to persuade Jones to have mercy, the pirate holds a sword to his throat and taunts him about his actions, which he deems cowardly . However, after becoming possessed with an entity known as the Dark One, Rumplestiltskin seeks out Jones, wishing to continue their duel . In this fight, Jones's life is saved by Milah, who opts to make a deal with her ex-husband . However, Rumplestiltskin is unable to forgive her for abandoning their son Baelfire, so he kills her . When Jones tries to exact revenge, Rumplestiltskin cuts off his hand, which he replaces with the hook he unsuccessfully used to kill the Dark One . From this point on, Jones became known as Captain Hook . Upon taking William Smee as his first mate, Hook returns to Neverland, as this would provide him with time to find a way to kill Rumplestiltskin . Shortly after his arrival, Hook gives shelter to Baelfire, who has arrived in Neverland and is on the run from Peter Pan . He forms an unlikely friendship with him, until Baelfire learns that his mother ran away with Hook, abandoning him . He is further enraged when he learns that Hook had been planning to use him to kill his father, beginning to realize that Hook is not so different from the man he wishes to kill . In response, Hook hands Bae over to the Lost Boys, the beings who serve Peter Pan . </P>

When does captain hook come into once upon a time