Kamen Rider Dragon Knight (2009)

While searching for his missing father, Kit Taylor finds an Advent Deck – a special card deck that allows the carrier to transform into a Kamen Rider and utilize unique weapons and powers – and uses it to become Kamen Rider Dragon Knight. He butts heads with Len, who serves as Kamen Rider Wing Knight, but the pair join forces after Kit learns that an alien warlord named General Xaviax is responsible for his father's disappearance and intends on using him and the entire human race, which he plans to abduct to gain power and rebuild his homeworld. Xaviax tricks people on Earth to work for him by promising them whatever they want, or in some cases, by exploiting their fears and desperation. Kit wonders why Xaviax has to trick them and why he doesn't just find bad guys to do the work for him. Len tells Kit that the decks were only made for one person, and that only a person with an exact DNA match as the original Ventaran rider could use it. This is why Kit is able to use the Dragon Knight Deck. He is the exact Mirror Twin of Adam, the original Dragon Knight, who betrayed the original team. One of the new Earth Riders, Chris Ramirez , joins forces with Kit and Len when he discovers he has been deceived, but is Vented along the way. Kit vents Albert Cho, brother of Danny Cho in retaliation. This leads to a personal hatred between Danny and Kit, as Danny seeks to avenge his brother against Xaviax's orders.

Later on Kase, a fellow survivor of Ventara like Len, joins forces with Len and Kit to fight Xaviax. In addition to training Kit to fight like a Rider, Len and Kase tell Kit all about the twelve Riders who banded together as the protectors of Ventara – a world opposite to our own – to take Xaviax down. However, due to the unintentionally traitorous actions of Kit's predecessor, Adam, General Xaviax destroyed most of the Riders via a process called Venting – which traps defeated Riders in the "Advent Void" between dimensions forever – and stole their Advent Decks. Furthermore, Xaviax continues to send out his Riders who fight to eliminate Kit, Len, and the other Riders who oppose him. After Kit is Vented, Xaviax recruits Adam to once again become Dragon Knight. Unlike previously when Xaviax convinced Adam to 'betray' the Riders by playing to his desire to remain with the girl he loves, Xaviax uses a combination of blackmail and using Adam's girlfriend as a hostage in order to force Adam to work for him.

Meanwhile, Len uses his Advent Deck to awaken the Advent Master Eubulon, who brings back the Ventaran Kamen Riders from the Advent Void as well as Kit, who becomes Kamen Rider Onyx. He also brings back Kase, though Eubulon is forced to briefly reassign the Advent Deck to Maya Young while Kase is trapped in the Advent Void. Once Kase is better, Maya gives back the deck and the riders head for Xaviax's base to destroy him.