Banquo is noble and loyal to King Duncan and, unlike Macbeth, does not contemplate acting on the Witches’ predictions. In Act 3, scene 1, however, he does seem to have ambitious thoughts.

The modern-dress show opens not with Scottish lord Macbeth putting down the Thane of Cawdor’s rebellion against King Duncan and then encountering three witches, but with his wife Lady Macbeth ...