A mysterious young lady walks through an underground prison, easy opening her path in front of her with magical orbs that explode. She opens her bag, and it seems to be the source of her magic. She breaks down the door of a cell, and it was Hex the Magician, who waits patiently for someone to let him out. He addresses her as his niece, and her name is Charmcaster. She has come to not only let him out of prison, but to deliver his staff to him. In a quick result, they easily get out from the prison's hold.
In a highway cliff, an elderly bus is about to fall off the cliff. Ben as Four Arms was able to save them, but it seems that the elderly want Four Arms to carry them off the bus as well. He doesn't seem to be happy about it much. In the RV, Gwen searches the Internet of magical items and artifacts, which reminds her of Lucky Girl. Ben enters and he complains that he deserves to have a day off from being a hero for once. Grandpa Max and Gwen said that he should be grateful for the power that he has been given. Ben recaps Gwen's way while she was Lucky Girl. His insult lets her throw a pillow in her face. Ben continues and he says that the elders in the bus offered him to come to a magic convention in Las Vegas. Ben wasn't interested in their offer, though Gwen overheard what he said and she seems to be happy to hear about it.
Somewhere, Hex and Charmcaster stand near a fire. Hex starts to chant a mysterious language, and it reveals to him an object called the Keystone of Bazell, and pinpoints to him the location of it. Charmcaster seemed to want to leave, but Hex tells her to stay put. With no choice, she stays put, afraid that her uncle might hurt her.
Ben, Gwen, and Grandpa Max arrive at the magic convention in Las Vegas, Nevada. Her expectance of the event doesn't seem to satisfy, but Ben seems to enjoy what he's looking for so far. Grandpa Max tells her to look around some more, in case Gwen finds something that she might like. She spots a booth that offers magical charms, and a specific one seems to satisfy her enough. Before she finishes explaining to Grandpa Max about the charm she found, screaming is heard from outside.
A man is hanging from a rope attached to a flying helicopter, and it seems that the helicopter is breaking down. Ben transforms to Stinkfly to save the man, though the situation seems to have worsened after the blades popped off. Gwen finds that Grandpa Max doesn't notice the blades heading his way, and she immediately goes after to push him out of the way. Mysteriously, the charm in the bracelet sparkles, and she pushes Grandpa Max out of the way just in time. Her amazing stunt intrigues him. Immediately, she knows what she's just been given.
Stinkfly continues to hang on under the helicopter, and he uses his slime to create threads that were able to hold the helicopter in place. Stinkfly was able to stop the copter, but the man was ready to fall when they see that the rope holding him was burning. He falls down, but in an instant, Lucky Girl comes to the rescue, and catches him just in time. The crowd cheers for Ben and Gwen's teamwork. Stinkfly was amazed that Gwen got her powers back, but he seems to be happy about it, just in case he needs backup.
In the RV, Gwen researches more information on the charm, figuring out that it is related to the Charms of Bazell. Ben thought that she destroyed all the charms a while back, though she explains that it is the legendary lost keystone of Bazell. It can amplify one's skills and powers ten times its normal value.
They head back to the Magician of the Year convention, and they watch the upcoming event. As the announcer tells the audience that the next contestant is about to attempt for the crown, Ben seems to have an idea in what to do. The magician in the stage calls for a volunteer, and Ben was the first to come up and do it. He puts Ben into the box, and in a matter of seconds after the man chants Abracadabra, Ben as Wildmutt comes out, immediately causing the audience to cheer for the magician's act. Grandpa Max and Gwen seem to be the only one in the crowd to ignore Ben's attempt at getting attention. A cloud of red dust hovers above the building, and it directs to the stage, where Hex then appears. He sees Gwen, and he orders her to hand over the charm.
Hex realizes that the audience is looking for magic tricks. So to go along with the subject, he uses magic that threatens them. Lucky Girl comes to stop Hex and Charmcaster. Hex grabs a hold of Gwen's arm, though he seems to forget that the Keystone has the ability to strengthen one's attributes, learning it the hard way after being thrown by Gwen. Charmcaster then attempts her fighting style. She opens her bag to release little objects, which then grew into massive creatures. Wildmutt comes to try and pin her down, though her strength in magic overcomes Ben's advantage over her. Hex finally gets back up on his feet, and causes a feedback that pushes Grandpa Max and Gwen into a garden labyrinth. More of the mysterious creatures then stop by their feet, and then transform to chase them. Luckily, they were able to get out of their sight.
Hex and his niece come in, and he orders her to track them down. Grandpa Max, however, is being chased by the giant stone monster, but Wildmutt was just in time to save him, though he ends up turning back into Ben. Lucky Girl on the other hand, encounters Charmcaster, and Lucky Girl was able to take her bag away. Charmcaster tells Gwen that she's innocent and that she wants to get away from her uncle. Gwen is suspicious of her claims, though she immediately goes on her side after learning about Hex's threat of what he might to do Grandpa Max and Ben if she doesn't hand the charm over. Charmcaster opens her bag and releases bats that drop him into a nearby pool. Little did Gwen know that she's been fooled, and Hex realized that Charmcaster was smart to act. The eclipse is near, and Hex readies the ritual to re-create the Charms of Bazell.
Gwen puts herself down after realizing that she was fooled by an act, but Ben warns her that Hex must be stopped before the charms are re-created. They now must go to the highest point of the city, where the ritual will be performed.
Hex chants a mysterious language, and the keystone rises to the sky. The eclipse draws near, and time is short. Ben insists for Gwen's help, just enough to cheer her up. Ben still can't activate the Omnitrix, though Grandpa Max finds another way to get up the building. Gwen and Grandpa Max head to the window washer's platform, while Ben finds another way to the top.
Lucky Girl comes up to interrupt Hex's chant, and she appears to have arrived at the top by levitation. Charmcaster is not buying the trick that Gwen is attempting. Hex pulls off her act to find Grandpa Max holding her up in his shoulders. Though they find that Gwen has no powers, Ben comes along with Hoverboard's board. He hits Hex right in the head, though he ends up being pushed off to the edge of the board. Lucky Girl on the other hand tries to pin down Charmcaster, though Grandpa Max and Lucky Girl end up in the roller coaster.
Ben continues to hang on for his life, but it was enough time to recharge the Omnitrix. Hex knocks him off, and he was meant to change into Four Arms, though he ends up as Wildvine. He uses Wildvine's ability to grow to hold on to buildings. Charmcaster throws the magical orbs onto the coaster tracks, making Grandpa Max and Gwen in danger. Luckily, Wildvine was able to grab a hold of them.
Hex tells Charmcaster that he'll continue the ritual from there, though it seems that she turns on him. She says that she needed a master to use his powers enough to activate the ritual. Hex tries to grab a hold of his staff, though with no success. From there, Charmcaster continues the ritual to complete the Charms of Bazell. Charmcaster isn't afraid of Lucky Girl, though she was able to activate the staff. To finish the job, Wildvine uses his hands to destroy the newly created charms, and sends the magic off of Charmcaster and Hex, sealing it away in the keystone. Gwen realizes that the charm may have lost its power, and she may not become Lucky Girl again, but Ben tells her that there are other ways to be a hero. She rides the hoverboard to show Ben a fine example. But little did Gwen know that the Keystone of Bazell may still have power, after showing itself to glisten mysteriously.