The Labyrinth (3): When in Rome (S03E09)

Zack and Ivy manage to flee from the future and track Carmen down to Rome. Once there, the detectives find themselves imprisoned and facing a dire fate: they must battle each other in the brutal Coliseum games. Fortunately, they dodge the grim fate of fighting to the death. After their escape, they uncover Carmen's scheme—she intends to steal the Coliseum itself! The detectives come to a shocking realization: this is all part of her grand ambition to become "the greatest thief of all time" by pilfering treasures from every era.