Watch Harry Potter and the Prisoner of Azkaban full movie online 0123movies. Watch Harry Potter and the Prisoner of Azkaban 123movies online for free. Harry Potter and the Prisoner of Azkaban Movies123: It's Harry's third year at Hogwarts; not only does he have a new "Defense Against the Dark Arts" teacher, but there is also trouble brewing. Convicted murderer Sirius Black has escaped the Wizards' Prison and is coming after Harry.