Kamen Rider: Dragon Knight: Season 1

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Kamen Rider: Dragon Knight" Season 1.
Keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints:
Use ONLY provided synopsis and sources.
No invented/guessed details (titles, names, dates, etc.).
Original, neutral, encyclopedic prose.
Plain text (no markdown, no asterisks, no headings, no bullet points in the text itself, though the primer is an array).
Output: Valid JSON only.
Source Material:
TMDB Synopsis: Parallel dimension Ventara, warriors Kamen Riders fight Xaviax with Advent Decks. War wiped out all Riders except Len. Len follows Xaviax to Earth. Xaviax tricks citizens into becoming new Riders. Kit Taylor finds Advent Deck, becomes Dragon Knight, investigates missing father. Joins Len (Wing Knight) to defeat ten corrupt/misguided Riders sent by Xaviax. Goal: Save Earth, find Kit's father, take back home.
Source [1]: Kit Taylor finds Advent Cards.
Source [3]: American sci-fi superhero series, aired on The CW (CW4Kids) from Dec 13, 2008 to Dec 26, 2009. Adaptation of Japanese Kamen Rider Ryuki.
Source [4]: Advent Deck allows transformation and unique weapons/powers. Kit and Len (Wing Knight) butt heads but join forces.
Drafting Overview:
The American science fiction superhero series Kamen Rider: Dragon Knight follows Kit Taylor, a teenager investigating the mysterious disappearance of his father. During his search, Kit discovers an Advent Deck, a special card deck that enables a user to transform into a Kamen Rider and utilize unique weapons and powers. Upon becoming Kamen Rider Dragon Knight, Kit joins forces with Len, known as Kamen Rider Wing Knight. The two must contend with Xaviax, an evil warlord who traveled from the parallel dimension of Ventara to Earth. In Ventara, a war involving warriors known as Kamen Riders using Advent Decks resulted in the near-total destruction of the Riders, leaving Len as the sole survivor. On Earth, Xaviax tricks ordinary citizens into becoming new Kamen Riders to execute his plans. Kit and Len work together to defeat ten corrupt and misguided Riders sent by Xaviax to attack them. Their mission is to save Earth from destruction by Xaviax, locate Kit's missing father, and reclaim the home they hold dear. The series originally aired on The CW as part of the CW4Kids programming block