Thunder Struck

Thunder Struck is the two-part finale of Power Rangers: Dino Thunder.

Synopsis
As Mesogog prepares a weapon to transform the Earth back to the era of the dinosaurs, and Zeltrax unleashes the Zelzord - the Rangers must consider sacrificing their powers in order bring down Mesogog for good.

Part 1
Mesogog tortures Anton Mercer as he prepares to unleash his master plan. He activates a powerful cannon that is designed to transform all humans into dinosaurs. Meanwhile, Trent observes all of this in secret to get information on Mesogog's plan for Tommy and Hayley. Meanwhile, the other Rangers talk about the prom. Conner goes through his list of potential dates, while Ethan doesn't plan to go and Kira doesn't seem to concerned. Meanwhile, Devin plans to ask Cassidy to the prom, but Cassidy informs them that they have to find the identities of the Power Rangers right away or they're fired. Mesogog needs an incredible amount of energy to power his cannon, which is why plans to get the Dino Gems, but ensures he has enough by draining the power that he gave Elsa. Trent confronts Mesogog about releasing his father and promises to get him the Dino Gems for an exchange. Elsa finds herself on top of a building, but is soon found by Zeltrax who is seeking his ultimate revenge. Ethan is in line to get tickets for Asteroid Conquest 2 when he called into action. As he runs off, he doesn't realize that someone is listening. The Rangers rush to stop Zeltrax who they spotted going after a woman they don't realize is Elsa. As the Rangers morph into action, Devin who was in the alien costume has followed Ethan and is filming the entire thing. The Triassic Ranger activates the Battlizer and takes down Zeltrax, but he escapes before the blast. Meanwhile, Tommy rushes in to save the woman and discovers that she is Elsa is now free from her brainwashing. As the Rangers rush Elsa back to the Dino Lab, Zeltrax follows them and discovers their secret location. Trent informs the other Rangers of Mesogog's plan and says giving him the Dino Gems is the only chance that they have of getting in to stop him. As Trent goes to open an invisiportal, Hayley presents the Triceramax Command Center - an armed vehicle designed to take down Mesogog's Island Fortress. Trent confronts Mesogog and demands that he release his father, but Mesogog can't be trusted and sends Trent to the floor with his mind attack. Trent is able to open the invisiportal just in time for the other Rangers to make it through. The Rangers and Hayley arrive on the island, and are confronted by the Tyrannodrones. The Rangers take them on as Hayley goes after the cannon. As the Triceramax heads to take down the cannon with its laser, the Tyrannodrones interfere with the beam, but Conner comes to the rescue. Hayley uses the Triceramax Command Center's laser to destroy the cannon and inflict heavy damage upon the Island Fortress. Mesogog gets caught in the collapse of the Island Fortress as his machine overloads. Trent retrieves the Dino Gems and rescues his father The Rangers have no time to wait for Trent and have to hope he finds his own way out. Trent and Anton Mercer make it out just in time with the Dino Gems intact. Meanwhile, Zeltrax invades the Dino Lab and kidnaps Elsa, leaving the Lab in ruins.

Part 2
The Rangers return to find the Dino Lab demolished and Elsa missing. They check the black box to find out that Zeltrax is responsible. Not long after, they show up as Zeltrax unleashes his powerful Zelzord to attack Reefside. Zeltrax holds Elsa captive inside the Zelzord as she tries to talk some sense into him. The Black Ranger invades the Zelzord to save Elsa and stop Zeltrax once and for all, but he runs into the Triptoids. Meanwhile as the White Ranger fights the Triptoids on the ground, the other Rangers use their Megazords to confront the Zelzord. Kira rushes off to help Tommy and they both come to Elsa's rescue, but Zeltrax won't let them go without a fight. Zeltrax powers up into his ultimate form, but the Yellow and Black Rangers are still finally able to destroy him. Zelzord however remains too powerful for the Thundersaurus and Mezodon Megazords to stop on their own. Tommy instructs them to summon all of the Dinozords to stop Zelzord, but they must ultimately sacrifice the Dinozords before they are all destroyed. Conner and Ethan barely make out alive, but it can't be over yet, can it? Mesogog has survived and has absorbed enough energy from the Dino Gems to become a powerful monster. "Dino Thunder, Power Up!" the Rangers call out as they morph into action to take down Mesogog. Mesogog is too powerful for even the Battlizer and his DNA copies itself to make clones and four times the trouble. The Power Rangers must summon all of their power from their Dino Gems to unleash an unstoppable power. The Dino Gem power becomes a giant dinosaur of energy which devours Mesogog and all of his clones. The Power Rangers Dino Thunder pose victoriously as Mesogog is destroyed once and for all. The Rangers used all of their Dino Gem power to destroy Mesogog and they have returned to normal with their Gems as no more than artifacts. Cassidy and Devin have been taping the entire battle and know their secret identities, but have decided to give up the tape, because of their friendship. Tommy reminds the others that their lives may go back to normal, but they'll never be the same. Devin and Cassidy show up at the prom together. Conner arrives there with Krista, the "tree girl", because it's what's on the inside that counts. Ethan brings Angela a girl he met standing in line for tickets to Asteroid Conquest 2. Trent reveals that he will be going to art school in the fall, and Tommy has decided to live the quiet life, but we all know how that usually goes. Elsa has taken over the position as the new principal, and Anton asks her for a dance with an old friend. Tommy goes to the stage to introduce the band and gives everyone props for all they've been through during the year. Kira is introduced and sings as everyone enjoys the dance and memories are shared.