The evil Lord Miraz (Sergey Castellito) killed his brother and held Prince Caspian (Ben Barnes) hostage for a long time, waiting for an opportunity to usurp the throne. Forced by Miraz's murder, Caspian fled the castle in the middle of the night and ran deep into the jungle of Narnia. Chased by the enemy, Caspian blew the horn in panic. In another world, Peter (William Moseley), Susan (Anna Popplewell), Edmund (Scander Keynes) and Lucy (Georgie Henley) have become ordinary students on the streets of London. But the blowing of the horn made them feel the call of Narnia again. 1,300 years later, Narnia, controlled by the Telmarines, is waiting for the king and queen to save it.