Captures and Kidnapping

In many a story, there comes a time when the villain captures or kidnaps someone (usually the hero, heroine, or someone he/she cares about). He or she does it for these reasons: Not all villains can do that, but when the antagonist abducts or captures someone, it can raise the stakes. Noteworthy examples are alien abductions, Captain Hook's kidnapping of the Darling children, and David Lo Pan capturing Miao Ying and Gracie Law to marry and sacrifice.
 * To use as bait or lure the hero into his or her trap
 * To use as a slave
 * To demand a ransom
 * To demand someone's obedience
 * In the case of the heroine, to marry against her will
 * To feed or sacrifice to a god or monster