The Moat Monster was a mini-boss in Sly Cooper: Thieves in Time.
The three-headed legendary beast was built by the Black Knight (Penelope) to guard the castle. In the job "Mechanical Menace," Sir Galleth Cooper went to the lair of the dragon to unplug the Moat Monster's plug from the socket. Although he unplugged it, the Moat Monster was awoken and swallowed Sir Galleth. A few seconds later, Carmelita Fox climbed the top of the tower to fight the Moat Monster, and won. In the final Operation later, Bentley used what was left from the Moat Monster to build a robotic suit to defeat Penelope's "Black Knight" armor and rescue Sly Cooper from the debris that was squashing his leg.
- This is one of the two mini bosses in Sly Cooper: Thieves in Time. The other is Wildman Weezner.
- The Moat Monster was likely based on King Ghidorah from the Godzilla franchise, as well as the Hydra from Greek Mythology.
- The Moat Monster is one of three mini bosses in the entire series to die. The others are Wildman Weezner and Dr. M's Mutant Fish.