Some Kronian Elders review the old adventures of Zak, Cloe, Kiet and Fenzy when they defeated the Mariscal Zorn against all odds. To the end if the episode they discover that Sidmodius and Chronam-Yatt, survivors from the Zorn times, are planning something terrible.
On Earth starts to appearing unknown monsters and our Sendokai warriors will have to fight again to defend us. Later with the help of Tänpo and Lalith, discover that this invasión of monsters has been caused by Sidmodius and Chronam-Yatt.
Sidmodius is becoming more powerful every day so Tänpo sends the kids to Masara to detain him. Once there, Zak will have to face a group of Yakis proving to Lon he is the leader of the team.
Once on Masara confrontations with Yakis are more difficult, So Danima, the Sen priestess, decides to train the kids to enhance their powers and to be able to sabe Masara and the Earth.
Lon struggles with team integration due to his father's advice. Danima warns that the Yakis will grow stronger, and only two warriors can defeat them. She provides armor that enhances their powers through combined Sen energies.
Tänpo faces his brother Kento in a Sendokai combat to recover his confidence. Also they will discover that Sidmodius is planning to become the Great Zorn changing history.
Cloe has to decide with who to try the Duo-Sen Lightning, Zak or Lon. She chosed Zak, but they fail because Zak is not focused. There is another option to try the Lightning and Cloe decides to do it with Lon this time and they get it.
Zak will have to unite Masara inhabitants to fight against the Yakis and defeat Sidmodius. However the team loose their confidence in Zak because he gives a great opportunity to Sidmodius to get his plans.
Zak leaves the team as he can not keep up with them without their trust. Meanwhile, Lon takes the opportunity to convince the kids and Tänpo that he can be the new leader of the team and he will lead them to win the first Great Tournament of history.
After wander alone through Masara, Zak must chose between madness or assume his responsibility and to fight in the Great Tournament again with a new team.
Zak finds a new team to participate in the Great Tournament, the Kiwuns. He will try to find their virtues, for defeating the wild Norkings in their first Tournament's battle.
Sidmodius has become a hero in Masara, and now the only way to defeat him is that Zak, Cloe and Lon clarify their mixed emotions. Zak and Cloe agreed that they are friends but rivals during the Tournament.
Lon, Cloe, Kiet, and Fenzy train for the Nero-Sen Fusion to defeat Sidmodius, but fail because Lon is distracted by thoughts of Cloe and his father, while Cloe is distracted by thoughts of Zak and Lon.
Zak continues leading the Kiwuns team and he should teach them how to control their feelings to win a combat. Also Zak has to control his feelings for Cloe. Friends and rivals?
During the combat against Zak and the Kiwuns, Lon gives orders to the kids with which they don't agree and starts to attack alone. Zak needs to apply all the things he has learnt as Kiwun's leader to defeat Lon in the semifinal.
Zak, Cloe, Kiet and Fenzy are together again and should to defend the Earth from another invasion of Yakis. All before coming back to Masara for the final of the tournament against Sidmodius.
The final of the Great Tournament is really hard and the guys give their best to face Sidmodius, who has absorved Danima's powers after she passed away.
The only option for our Sendokai warriors in the final is to be absolutely attuned to make the Nero-Sen Fusion as well and to defeat once and for all Sidmodius.
In the last episode Zak faces a last challenge: to sacrifice himself in order to defeat Sidmodius (who now is a giant Yaki), and so to save Masara (the Earth millions of years ago), his team and of course, Cloe.