Geraldine (Gerry) O'Toole was a wood nymph who placed a curse on Darrin's family for murdering her beloved Rufus The Red in episode "A Most Unusual Wood Nymph." A wood nymph is a witch's worst enemy, and Samantha had to travel back in time to the 15th Century to meet Darrin's ancestor, Darrin The Bold and shop him from committing the murder.