Season 1

Three Space Knights are chosen to become Tekkamen. In space, the United Earth Fleet is fighting off another invasion by Radam. The Radam bring Tekkamen and wipe out the fleet. They send missiles to Earth. This causes a problem during the Tekkaman evolution process for the three new cadets and a computer error resulting in Yumi receiving the Reacter Voltekka instead of Natasha. The Space Knights attack Radam but are overpowered. When attempting to help them, Yumi uses Reactor Voltekka but is unable to control it's power, leading to a disaster.

Yumi is training and becoming better. Radam hit the Space Knights' HQ. The Space Knights hold back out of compassion for the enemy. Aki joins the fight and kills the Radam Tekkamen.

Blade finally shows up and destroys a group of Radam. Yumi contends with Aki for D-Boy's love.

Dead End makes his first appearance. He defeats Blade in the middle of a stormy night. The Space Knights want revenge but are defeated.

David befriends Dead and remembers Black September. We also get to see Noal and Milly (from Tekkman Blade) in a flashback and learn of what happened to Noal: he is apprehended by military police who support the General. His ultimate fate is unknown.

Blade battles Dead in a final showdown.