An Evil Necklace is the seventh episode of Scooby-Doo! And The Paranormal Adventures.
Velma, Daphne and their classmate, Violet, go shopping. They come to a jewelry store and Violet finds a mysterious necklace. Violet wants to buy it and the jeweller tells her that he found the necklace behind the store a few days ago and he doesn't know what it is. Despite the warning, Violet buys the necklace and tries it on. Violet starts to feel weak and Velma and Daphne take her back to school. The gang watches Violet lying on her bed when suddenly the necklace starts to glow. Violet's eyes open to reveal that they're glowing. Violet then flies out of the bed and attacks the gang. Violet then says in a different voice "You'll surrender to Queen Rosilia!". Violet then escapes. The gang decides to find out the truth about the necklace and Queen Rosilia to help Violet. The gang soon finds out the truth: Queen Rosilia is an ancient sorceress who had a great power to make anyone her slave and the necklace is the source of the power and it even contains her spirit. The gang decides to remove the necklace to save Violet, but first they have to bring her to them. Scooby and Shaggy are voted as a bait. Meanwhile, Violet captures Mr. Garrison and turns him into her slave. Scooby and Shaggy find her and have her chase them into a trap. Unfortunately, Scooby and Shaggy mess things up again. Violet then uses necklace to turn Shaggy, Fred and Velma into her slaves. Violet then sends Shaggy, Fred, Velma and Mr. Garrison after Scooby and Daphne. After running around the school, Daphne tells Scooby that they can't run forever and have to remove the necklace. Daphne comes up with an idea and whispers it to Scooby. Violet, Shaggy, Fred, Velma and Garrison search for Scooby and Daphne. They find Scooby and chase him. Scooby leads them to a cliff where Daphne is waiting. Scooby and Daphne are then surrounded by Violet, Shaggy, Fred, Velma and Garrison. Violet asks Daphne what she can do now. Daphne says that she can't do anything now and asks Violet to show her the necklace. Daphne tears the necklace from Violet's neck and it crashes. With the necklace destroyed, Rosilia's spirit disappears and Shaggy, Fred, Velma, Violet and Garrison are turned back to normal.