Dyna Dragon

Dyna Dragon (ダイナドラゴン) is a mecha created and controlled by Ippei Baba and Kana Inoue. It was designed based on the figure of Tyrannosaurus, specifically its skeleton as one that was recently discovered.

Subitle: Combined Super Dragon (合体超竜)

Denkou Choujin Gridman
Dyna Dragon was originally two separate fighters of Assist Weapons, serving as Gridman's reinforcements during combat. The Dragonic Cannon was first made to counter and destroy Mecha Bagira after it reanimated a Chinese Mummy to attack a research facility. In its next battle, the giant cannon revealed itself as an aircraft named Dyna Fighter and played a crucial part in exposing Mecha Flamelar's weak spot.

The King Jet was already designed by Ippei sometime later but wasn't able to decide the color of its wings until his art teacher suggested him to use the color white. The King Jet was deployed as Dragon Fortress, having combined with Dyna Fighter as both aircraft split and expose Mecha Stealgan from its invisibility.

The data of Dragon Fortress was implemented with the image of Tyrannosaurus, giving the fighter a suitable body to operate and transform into Dyna Dragon, fighting side-by-side with Gridman on various occasions. With Venora's toxic gas almost killed Gridman, Ippei created a combination program to counter its effect, remodeling Dyna Dragon in a similar vein to God Zenon, fusing with Gridman into King Gridman and helped turning the tides of the battle. Ever since the reprogramming, Dragonic Cannon and King Jet are programmed to be sent into battle with this form.

Its final battle was as King Gridman in against Skubone. Dyna Dragon, God Zenon and Gridman Sword were destroyed by Giant Khan Digifier after he invaded Junk's server and attacked the Assist Weapon cache.

Denkou Choujin Gridman: boys invent great hero
Dyna Dragon and its components were part of adult Takeshi Todo's recollections of Gridman's past battles. The Dragonic Cannon is also shown here held by King Gridman instead of his original form.

However, the destruction of Dyna Dragon is played differently: instead of being slashed as a program, Dyna Dragon was already formed as King Gridman while Khan Digifier destroyed the entire armor effortlessly with Elimination Ray Digifier Beam.

Trivia

 * Dyna Dragon may have been inspired by the Transformers character Trypticon, a Decepticon dinosaur that transforms into a fortress. This is not surprising, as Takara (the company that sells Transformers toys in Japan) is also one of the sponsors of Denkou Choujin Gridman.
 * The Dragonic Cannon is based on the Chi-Powered Bazooka that appeared and used by the titular team of Gosei Sentai Dairanger. Fittingly, both Gridman and Dairanger are aired on the same year (1993 to January 1994).
 * In contrast to other Assist Weapons, Dyna Dragon and its components can act as a weapon (Dragonic Cannon), support vehicles (Dyna Fighter and King Jet), independent robot (Dyna Dragon), and Gridman's armor (King Gridman) altogether.