Sapphire and Tink experience a variety of adventures, including encounters with Satan, a warlock who wants to steal Sapphire's special two-hearted soul and take over the kingdom. However, he is always frustrated by Tink and his fear of angels, and by his own daughter, Hecate, a demonic-shapeshifting witch who at first she appears to be evil like her father, but who covertly helps Sapphire foil her father's plans. Sapphire also dons a Zorro-style mask at night, fighting crime as the Phantom Knight, and gets involved with Franz Charming, the young prince of neighboring Goldland. Their relationship is multi-faceted; Franz is familiar with Sapphire as three entirely different people and has different feelings toward each. He is good friends with Prince Sapphire, in love with the unnamed princess, and despises the Phantom Knight, whom he believes is a rival for the Princess's affection.