Summoning Monsters and Henchmen

In any story, one of the most famous feats a villain does is to begin Summoning Monsters and Henchmen to do his or her bidding. For instance, the evildoer can:
 * Sic his/her pets or thugs on the hero(es) or runaway(s).
 * Persuade a legion of monsters or army of the dead to rise.
 * Rally an army or a lynch mob.
 * Call forth an army.
 * Employ or persuade a mob or an army to do his or her bidding.
 * Turn a seemingly innocent creature into a monster.
 * Send his or her men to bring down or capture the hero(es).

Animated Films

 * Moreno unleashes his hound, Amrok, and sends him to hunt down Maki after he escapes the slave camp.
 * Zira rallies her followers to invade the Pride Lands conquer Pride Rock.
 * Nassor summons Colossus from his tomb.
 * Marina del Rey calls up her evil pet eels and sends them to kill Ariel and Sebastian.
 * Marcel calls up Nigel and sends him to track down Blu and Jewel.
 * Shan-Yu summons the Hun army to bring down Mulan and the Imperial Army.
 * Dawn Bellwether sics her thugs on Judy and Nick.
 * Ruber concocts a potion that turns his goons into iron-creatures to help him with his plan.
 * Archibald Snatcher sics Mr. Gristle on the boxtrolls.
 * Scarlet Overkill summons her henchmen and sends them after Kevin, Stuart and Bob after they crash her coronation by mistake.
 * Captain Hook orders Smee to pipe up the crew in both the first film and the sequel.
 * The Horned King summons the Cauldron Born via the magic of the Black Cauldron.
 * Hades freeing the Titans preparing to defeat Zeus.

Live-Action Films

 * Evanora and Theodora rally the Winkie Guards to bring down Glinda and her citizens.
 * The Wicked Witch of the West summons her Flying Monkeys to capture Dorothy and Toto.
 * Ultron summons his army of clones to lay siege to the world.
 * Dorian Tyrell sics his goons on Stanley Ipkiss for stealing his money.
 * Imhotep summons an army of mummies.
 * Megatron orders his Decepticon henchmen to attack.