That '70s Episode

The Halliwells encounter a warlock that has been waiting for years to obtain the sister's powers.  The warlock is immune to the powers of the Charmed Ones after making a deal with their mother to spare her life in the past.  In order to save themselves, the girls cast a spell which returns them to mid-70s when the deal was made - their grandmother and mother are still alive, Prue and Piper are playful little witches and Phoebe is still unborn and in the womb.

Book of Shadows

Friends

• Patty Halliwell
• Penny Halliwell/Grams

Enemies

• Nicholas

Spells

• Three spells used

Trivia

• The episode title is a play on words to the television series That '70s Show.
• Little Piper has green eyes, but adult Piper has hazel ones.
• The episode reveals the girls were born with their powers.
• The girls knew Andy when they were children.