Phobos finds an ancient star-shaped stone and decides to use it to find out the identity of his long-lost sister. Meanwhile, the girls decide to give Blunk a bath, but are unsuccesful and even more so as the stone leaves them powerless and stuck in Guardian form.
- Big "NO!": Cedric tells Elyon this when she returns the stone of Threbe back to him, as he knows this would return their powers to the Guardians.
- Bittersweet Ending: The girls regain their powers and manage to defeat Phobos' giant carnivorous plant, but that means that he managed to discover his sister's identity.
- Brought Back To Normal: The Guardians are stuck in this, when Elyon takes the stone of Threbe as it depowers anyone or anything who wants to prevent her from returning home. That's until she decides to return it to Cedric.
- Irony: The stone of Threbe was created by the Mage to help princess Weira (Phobos and Elyon's mother) to return back to her home and parents. However, years later her son Phobos uses it to identify his sister to drain her powers.
- Sickly Green Glow: The stone of Threbe glows in a green color and it depowered the Guardians.
- The Faceless: Phobos' sister when entranced by the stone of Threbe into taking it, has her face covered in shadow, until she regains her senses and brought the stone back to Cedric, revealing herself to be Elyon.
- Wham Episode: Phobos' sister is revealed to be the girls' friend Elyon Brown.
