A large number of the earlier Season 8 episodes take place when Samantha and Darrin are away in Europe on vacation. In this season opener, they are touring the Tower of London when a warlock, trapped in a painting, begs Samantha to free him as he was placed there by the curse of an evil witch. Samantha does so and then must pay the price as the furious witch sends her back to the court of Henry VIII without her powers or her memory of having lived a former life.
I enjoyed this episode and I loved the version of "Early One Morning" which was sung to Henry, but almost the exact same plot was used when Samantha ended up back in Salem during the witch trials and Darrin had to go and rescue her. Still a good one here though, and fun to watch.