the gold THE SPT-ZK-53U Zakarl stands in front of an human shuttle ‘Tell me humans,DO YOU SEEK TO BE reducated from the start by a glorious Gradosian like me?!’ he is the pilot THE Zakarl,an devastating powerful GOLD SPT WITH A STRONGER V-max system that can shreds fleets! the SRW J version of him is rather different,instead straight up invading the earth itself,he instead chooses to manipulate the Jovians (humans of the Jupiter.) into attacking their own kind,attacking and waging a war with the earth,that plan was invented by Shapiro,a former member of the earth federation force who faked his death,ru kain spared him since Shapiro has proven his competence to him,he’s a man who’s believes in the might makes right,to him ,if he can’t rule,he would be without a purpose,without meaning,he and his army took over the moon for 2/3 of the story of J, in C.E 71, ru kain launch his fleet against Duane Halberton’s fleet.(the creator of The stolen G weapons.),the death platoon squad annihilates Duane’s supporting lunar frame Aestevali army who’s supposed to be the earth federation’s space defense army,then RU KAIN personally destroyed halberton’s flagship. He and his fleet arrived to the moon to take over it,then he encounter the nadesico warship and it’s units,as he expected,the traitor Eiji asuka was there,Eiji tries to tell him the ‘supposed’ origin of Gradosian race,he laughed that Eiji for saying such nonsense that the Gradosian and humans may have shared the same creator,which to him was a bad joke,he send his army against the nadescoo and the robot pilots. they holds themselves well against his army . then he personally enter the battle alongside Shapiro,even,the humans they still able to survive him, unfortunately for them,they couldn’t even scratch his SPT’s color paint,the humans retreat ,then he takes over the moon,for rest of the war,RU kain spend his time sending his death platoon squad to do small operations on earth while controlling the moon.(unknown to him,the fury is there)