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The Red Dragon Thunderzord was the second Zord of the Red Mighty Morphin Power Ranger (Jason Lee Scott and Rocky DeSantos) and the successor to the Tyrannosaurus Dinozord. It first appeared in The Mutiny, after Lord Zedd's monster Pirantishead managed to take control of the Tyrannosaurus and the Dragonzord. After freeing the Tyrannosaurus from Pirantishead's control, the Power Rangers used the "power of thunder" to upgrade the Dinozords into the Thunderzords. [source: power rangers wiki]
The Thunderzords are the second set of Zords for the original Mighty Morphin Power Rangers. They succeed the Dinozords and were larger than their previous counterparts, with much greater strength.
The Red Dragon was the first Zord in the series to possess two battle modes: Dragon and Warrior. In Dragon mode (as seen in the previous post), it could breathe flame and attack with its claws mid-flight.
This is the Bandai Mighty Morphin Power Rangers Deluxe Red Dragon Thunderzord toy (released in 1994) in Warrior mode.
In Warrior mode, Red Dragon Thunderzord would fight opponents by hand-to-hand combat or by wielding its staff that he could spin at high speeds to attack, and to allow the Assault Team to fly.
Similar to the Tyrannosaurus Dinozord, the Red Dragon is capable of fighting and defeating a monster on its own. Its wrists are capable of spinning at high speeds, allowing it to use its staff like helicopter blades. It is also able to ride the Tigerzord while it is in Tiger Mode.
Not much articulation with these toys but the kids seem to love them :)
It could also merge with the other Thunderzords to form the Thunder Megazord, serving as the main portion of the Megazord.