The story is this,Alien Mefilas has created a Ultraman that is Very Powerful, it contains power of Ultraman Dark Zagi, Ultraman Evil Tiga,Ultraman Belial,Ultraman Justice, Ultraman Dyna and Ultraman Noa, at first it was failed, because of the light power, But Mefilas use the dark Ray to Brain washed the Dark Ultraman, the Dark Ultraman name was Ultraman Kaiba, so Ultraman Kaiba and Alien Mefilas with their Army come to M78, to raid there, So the story Begin, all the Kaiju army were there,So the Ultra Brothers now begin to stop it, include the new Generation, but then, the Kaiju is Getting larger,begin eat the Ultraman,Ultraman Neos is getting Eating.
Ultraman Blu also get eaten,Ultraman Rosso say "No!,Isami!...", Blu say "Brother!...", All the Royal Ultra Guards were Defeted, then Ultraman Kaiba has Arrive,So Ultraman Mebius saw and say "So It's Your Fault!", he jump and tried to punch him,But Kaiba block it and choke Mebius neck, then he Punch Mebius Ultra timer, just one punch and it just shattered, then Ultraman say "Mebius!!!!", so Ultraman Kaiba throw the body to the Hungry Kaiju,so the Kaiju eat Mebius body, then Ultraman Zero "So It Your Fault!!!!!!", he Jump and tried to kick him, Then Seven say "Zero No!!!", then Kaiba block it and grab his leg, then he choke him,after that Ultraman Zero student Z say "Master!", Kaiba talk to Zero "So your the one, Who Noa give his Power To him...", Zero replied "what?!", then he throw him to the Hungry Kaiju, then Seven say "Zero!!!!!", Zero say "What the ah!..., Ah...", Zero body was eating alive, after that all the Ultraman in M78 Were Defeted, so Ultraman Brothers say "we're are not easily defeted!!!", Ultraman Kaiba replied "oh really?!, Show Me!",after that the six Ultra Brothers start attack him,after that they were defeted, Ultraman Kaiba say "Your More weaker than Ultraman King!", Ultraman Zoffy say "King?!", Kaiba replied "Yes!, you know where he is now!, He's dead!, I kill him the same as what I did to the other Ultraman Universes!", flashback, he kill Ultraman Cosmos and burn his planet, he kill Ultraman Gaia and Agul, he Destroy Ultraman Noa statue, Stab Ultraman Justice, he ripped Ultraman Zearth into Half(this story was before the discovery of Ultraman Solomon, Fantasy and Paladin) end of Flashback, so he say "good bye M78!", all the M78 building and structure were destroyed, Before All this happened, One Ultraman that can Control time named Ultraman Time knew this thing will happen, so he tell to the Galaxy Rescue force, but all of them didn't care, so Ultraman time use the time Portal to secretly teleport all the Junior Ultraman, The same time as Ultraman Hikari Create another Z riser,But it was different, the riser didn't has a Z in it.
so then, Ultraman Hikari teleport the riser to one Universe that is not been Touch by Kaiba, the same as Ultraman Noa send his last light life to another universe, between the two thing teleport to another universe, the riser and the light suddenly fuse into Evoltruster, then it crash landed in Mars.
so after the defeat all Ultraman from land of the light, all of them were force to weakening and Transfrom them into Cyborgs, so then Alien Mefilas really enjoyed that all of them turn into Cyborgs and then Taro refused to turn into cyborg, so he use Ultra dynamite, but it was stopped by Ultraman Kaiba, so Kaiba throw Taro into the Hungry Kaiju, So Taro was Eaten alive, so His Son Taiga say "Father!", so then all of them turn into Cyborgs, Except for Dyna, Orb,Ginga,Geed, Victory and Z, all of them go to one world, that is not been touch by Ultraman Kaiba, that world name is Cross Xyno world.