In 'Gladiator', who plays the emperor Commodus?

Who played Indiana Jones's father in 'Indiana Jones and the Last Crusade'? In 'The Matrix', who plays Agent Smith? Who plays Trinity in 'The Matrix'? In 'Gladiator', what is the name of Russell Crowe's character? In 'Braveheart', which Scottish hero does Mel Gibson play? In 'Titanic', what is the name of the necklace's giant blue diamond? In 'Jaws', what is the name of the police chief? In 'Jaws', who plays shark hunter Quint?