Season one, episode 15
In Warrior Princess Xena visits a palace and is surprised at how she is treated until the king explains that she is the spitting image of his daughter Princess Diana. The Princesses life is in danger so the king wants Xena to stand in for her look-a-like in order to foil the plot to kill her.
In Warrior Princess we see that Xena has many skills and so does Lucy Lawless. It was fun to watch Lucy play a different role.
Disclaimer: “Neither Xena not her remarkably coincidental identical twin, Diana, were harmed during the production of this motion picture.”