|This article is about a/an episode in Power Rangers Dino Thunder.|
House of Cards is the thirty-fifth episode of Power Rangers Dino Thunder.
The other Rangers start to get suspicious as Trent continues to try to keep his father's secret. Meanwhile, Principal Randall and Dr. Oliver battle it out in front of the school in front of everyone. When Elsa brings to life Ethan's Ruby Dragon card, the cards really begin to fall. Can Trent stop the other Rangers from finding out his father's secret and stop the Ruby Dragon?
Ethan uses the rare Ruby Dragon card to own Devin at Dragon War. Principal Randall shows up and confiscates the cards from them. In class, Ethan is distracted, because Principal Randall took his precious Ruby Dragon card. Tommy agrees to talk to Randall about getting the card back, but he arrives in her office just as she is transforming into Elsa. Look's like the secret's out. Elsa transforms back into Randall and Tommy follows her out in front of the school where they fight it out. The bell rings and all the students flood out of the school and are in shock to see teacher fighting their principal. Elsa reveals herself and resigns her position as she invisiportals away. Later, Trent confronts Elsa and demands the Ruby Dragon card, but she is planning to turn it into a monster. Trent and Elsa battle it out, but Elsa finally knocks a kick which lands Trent crashing into the Geno Randomizer. The Ruby Dragon comes to life and Elsa orders him to attack Trent. Later as the other Rangers are preparing for training in the woods, they are confronted by the Ruby Dragon. Meanwhile, Anton finds Trent unconscious, and tells him the other Rangers are in trouble just before he starts to Mesogog again. The White Ranger comes riding in on the Dino ATV to their rescue. Elsa shows up as well and confronts the White Ranger about the secret that he's keeping from the other Rangers. The other Rangers confront him about the secret, but Trent tries to dismiss it. Back at the lab, Trent admits to going alone to Mesogog's lab to get the card back. Tommy says none of them better attempt anything like that again. The alarm goes off and the Rangers are alerted to the Ruby Dragon's return. The White Ranger joins them late, and takes on the Ruby Dragon by himself. The Power Rangers combine their weapons to form the Z-Rex Blaster. The Rangers use the Z-Rex Blaster to destroy the Ruby Dragon. Once giant, the Rangers form the Mezodon Megazord, Thundersaurus Megazord, and Dino Stegazord to destroy the Ruby Dragon permanently. Mesogog is furious with Elsa's failure and warns her that he is about to lose his patience. Elsa plans to betray him before he has the chance. Later at school, Anton begins to get sick again. The other Rangers try to help him as Trent tries to back them off. The Rangers chase after Anton into a classroom to find out what's wrong. Anton transforms into Mesogog and reprimands Trent for betraying him, but Trent insists that he's his father and that he would never betray him. Meanwhile, the other Rangers are furious and Conner confronts Trent for betraying them. Tommy, Conner, Ethan and Kira angrily glare at Trent.
- James Napier as Conner McKnight (Red Dino Thunder Ranger)
- Kevin Duhaney as Ethan James (Blue Dino Thunder Ranger)
- Emma Lahana as Kira Ford (Yellow Dino Thunder Ranger)
- Jason David Frank as Tommy Oliver (Black Dino Thunder Ranger)
- Jeffrey Parazzo as Trent Fernandez (White Dino Thunder Ranger)
- Ismay Johnston as Hayley Ziktor
- Tom Hern as Devin Del Valle
- Katrina Devine as Cassidy Cornell
- Latham Gaines as Mesogog (voice) & Anton Mercer
- Miriama Smith as Elsa
- Bruce Hopkins as Ruby Dragon (voice)
- Tommy's secret identity is at stake when he fights Elsa in the school yard, but he doesn't seem to care very much about it.
- When the Rangers morph the second time, Tommy's key doesn't go into the Morpher.
- Even though Trent attacked the Ruby Dragon with arrows, he wasn't seen holding his sword while on ATV.
- Conner used the Battle Blast on the Tyrannodrones instead of the Ruby Dragon.
- This is the first episode that they use all five Ranger weapons to form the Z-Rex Blaster.
- Ethan is playing a card game with Devin. It could be possible that they started playing games after Devin beat Ethan on a computer game tournament in "Isn't it Lava-ly", Ethan being the defending champion and Devin the new one.
- In the last scene of this episode, Tommy is seen wearing green, but the viewer needs to look closely to see this.
- This is the last appearance of Elsa’s alter ego Principal Randall now that her identity has been exposed.