Is There a Woogy in the House?

When an Earthquake hits San Francisco, Prue, Piper, and Phoebe have to call the gas company to repair a leak in the basement. However, once the repairman arrives, he is possessed by the woogyman – a shadow demon previously defeated by Grams. After he banishes Prue and Piper from the house, he possesses Phoebe and in order to defeat the demon the sisters have to find a way to banish it again and save Phoebe.