The clouds seemed to have parted from its glooming appearance earlier, bringing back the sunny day that was previously there. The observers with in the garden seemed to be staring at the figure known as Black for quite some time, analyzing what was going on and trying to digest the situation. Black merely smiled that he had the opportunity to finish off the mortal known as Trunks again but he was also happy for another reason.

"To think that I still would find you here of all places Trunks. Its like fate wants me to put an end to your pitiful existence or maybe your soul is calling me to reap you from this world," Black mused.

"Oh yeah, well how about you try me!" F-Trunks spat but was held back by Vegeta before he could do anything.

"Don't Trunks, you're not strong enough yet," Vegeta suggested. Before anyone could even react, Goku flew into the air with an excited glee.

"Sorry guys but first comes, first serves is my motto of the day," Goku chuckled as he met face to face with Black. The two stared at each other like they were some long lost twins or something. Kuzuku walked beside 21 and the other, ready to protect them at any moment. He couldn't shake off the feeling that this Black guy was going to be nothing but danger. His eyes seemed so, devoid of life and was filled with a abyssal darkness that was beyond comprehension, totally contrasting to the Goku everyone came to love.

"Wow, you really do look exactly like me," Goku awed. Black let out a small laugh that was nothing but pure amusement.

"Yes, I do indeed and I've always wanted to square off against you in this body, Son Goku. It's almost too good to be true," Black laughed.

"Huh, what do you mean by that?" Goku asked.

"You don't need to worry about that. For now, let's just do things that we do best...," Black smirked evilly. From the palm of his hand, he fired a powerful Ki blast at Goku that came at him almost too fast. Goku smirked and kicked it into the air, impressing the doppelganger. Goku looked at him, still holding his expression strong and unwavering.

"Sorry Black, but you're going to have to try harder than that," Goku said, flaring his energy. He charged at Black with immense speeds and started to attack him with a barrage of punches. The villain had no choice but try to defend against the punches that were pretty much endless, so much so that his body was beginning to take damage in which that was what he wanted. Eventually Black ducked under a right hook and kicked Goku hard in the stomach, knocking the wind out of him. Black leered as he was ready to throw another punch at Goku's face but before he could, Goku had already vanished behind him with a elbow aimed downwards. Black noticed this and quickly blocked the blow, but he was still sent flying into the ground like a cannon, leaving the hero of Earth to float above and wait with anticipation.

"Whoa, I can't believe how much I've slacked off. If I had to guess it, Goku is as strong as my base form now. I should really hit up those training sessions with Whis sometime," Kuzuku awed. As soon Kuzuku said that, Black flared his dark Ki, alarming those who his substantial power increase. He looked down at his hands and started to laugh with excitement of his new power coming to life.

"Magnificent, I can't believe all this power that I've obtain in a mere couple of exchanges. Its exhilarating!" Black enthused, powering up even further. He dashed behind Goku with an overhead kick ready, catching the Saiyan by surprise and kick him hard across the face. Goku rocketed towards the ground and crashed with enough force to create a large gust of debris and wind, shaking the area upon impact. Black snickered evilly as the rift seemed to get wilder for some reason. Before Black knew it, Goku had turned Super Saiyan and kneed him hard in his stomach, having him practically gasping for air. Goku retracted his knee and unleashed a barrage of punches, pummeling his look-alike all over his body before roundhouse kicking him a great distance.

"Had enough yet? Come on and unleash all of your power," Goku said.

"Heheheheheh...graghh! Don't worry Goku, in do time you will feel my wrath soon enough. You just have to keep coming at me like that and hurt me even more because this pain only makes me stronger!" Black laughed.

"Ummm...okay, but just to let you know that I am totally not into those sort of things," Goku said dumbfounded by his statement. Black smirked and powered up even more, unleashing a blinding light that all too familiar. When it dialed down, it revealed he was something that was all too noticeable. His hair and eyes were undeniably a Super Saiyan. Kuzuku's sinking feeling seemed to be becoming a reality right before his eyes.

"This is bad, I don't know what he's doing but this guy Black is growing almost too fast. To learn Super Saiyan just like that is simply incredible," Kuzuku noted and wasn't alone since Vegeta was started to get annoyed by Black's absurd growth. The two charged at each other, exchanging blows one by one until Black landed a powerful elbow in Goku's stomach.

"Gaghhh!" Goku gasped before getting sledgehammered towards the ground. Black quickly generated a yellow and black Ki ball and fired it at the descending Goku. On contact, the blast exploded, rupturing the residence area and shaking the ground below as Black merely watched the light show. When the dust clear, Goku was revealed to be slightly damaged and staring up at him with electricity flowing around him and slightly straightened up hair.

"Alright then, how about Super Saiyan 2...," Goku muttered. The hero of Earth charged in and punched Black across the face, sending him several flips away in the air before he was gone again. In mere seconds, the villain felt a sharp pain in his ribs as Goku had already kicked him in his side. Black coughed out blood before being high kicked in the chin, stunned him long enough for another one to the gut. Goku finished off his assault with a punch to the face so hard that he nearly went right back into the portal but stopped himself.

"Grrrrrrrrrrrr...heheheheheh!" Black growled in pain before charging up even more of his Ki.

"No way...," Goku whispered as he watched his look-alike turn into a Super Saiyan 2 as well. In almost a mere instant, Black had delivered yet another powerful overhead kick that broke right through his guard and sent him flying enough to leave Goku wide open for a punch from above. Goku gasped for air as Black's fist rammed right into his stomach, sending him rocketing into the ground. The villain smirked evilly at his outstanding growth.

"I can't believe that even Goku is getting overmatched by him! He was strong in just base but now as a Super Saiyan, he's becoming unstoppable!" F-Trunks worried.

"No, it's not just that," Kuzuku muttered, catching the attention of everyone but Whis and Beerus since they noticed it to.

"Yes, Kuzuku is on to something and I think he and I are thinking the same thing. This Black character seems to be adapting as he transformed into a Super Saiyan but yet also getting even more powerful in the process. Remember, our Super Saiyan forms are mere multipliers to our power but Black isn't just doing that but also seems to be getting exponentially stronger as he fights. I don't know what exactly he is doing but if this continues, he could be proven to be dangerous," Vegeta explained. Kuzuku nodded as that was what he was exactly thinking until Black came to overhear their conversation from above.

"It doesn't matter how much you think, I will only continue to get stronger until I've achieve enough power that satisfies me! Now come Son Goku! Fight me more so I can further evolve my evolution, so that I can reach that godl-Graghhhhh!" Black was cut off when he felt a force, pulling on him. A gust of wind came from nowhere, alarming everyone that something unexpected had happen. The rift was seemingly the cause of this and was trying to pull Black back into it. While Black was distracted, Goku had already turned Blue and charged at Black before he could realize he was punched hard in his stomach, sending him flying further towards the rift. Goku quickly deformed and stared at the look alike, silently cursing that he didn't finished him with that punch.

"What's going on?" Bulma wondered. As she said that, the powerful gales that were running wilder, knocking over the time machine and hopefully not causing any major damage yet. F-Trunks looked over with worry that something might have gotten damaged.

"Crap, someone turn the time machine into a Capsule before he notices," F-Trunks commanded but it was too late. Black smirked sinisterly and let out a stray Ki blast to destroy the machine, setting it ablaze. Trunks gritted his teeth in rage at what the Goku copy had done while Black smirked before getting pulled back into the rift. The rift then closed for good and the highly pressured winds subsided quickly as the ordeal was settled with no conclusion. Trunks walked over to the fire that engulfed the time machine created by his late mother.

"Damn it! I made it back to the past and everything was going so well! Now it's all up in flames!" F-Trunks damned as everyone stood silent. That was when Bulma remembered something that she had forgotten about a long time ago.

"Wait hold on, I think I have a solution for this!" Bulma claimed as she scavenged through her pocket and pulled out her case of many capsules. She looked through each one as all eyes were on her. The Brief scientist's face glowed as she finally found what she was looking for and through the capsule onto the ground, exploding and materializing a something all too familiar. A similar time machine too the one that had just been destroyed but with a large hole in it and seemed to have collected some moss.

"Mom, you kept the time machine Cell used?!" F-Trunks astonished as Bulma giggled.

"Of course I did Trunks, did you think that I would let someone this ground breaking slip out of my fingers? The best thing is, with the notes that my past self made, I can definitely make repairs in no time," Bulma smiled.

"Good then until you're finish, I will be off training and no one shall get in my way!" Vegeta said, storming off towards the gravity room.

"Vegeta never changes huh? Well then since everything is settled, how about we all train together. It's been awhile since someone threatening came along and to think that it's someone with my face makes things more exciting!" Goku enthused. Kuzuku nodded in agreement at the suggestion and took the opportunity at hand.

"Alright, I'm down. Its been a while since both you and I sparred Goku .21 had already left with Bulma to work on the time machine. She seemed a little too happy," Kuzuku chuckled seeing that Bulma was walking away with her notes and 21 was following but only beaming at the notes held in the scientist's hands. With that, everyone decided to go off and train like no tomorrow but Trunks couldn't help but take a glance at Mai who ran pass him with her gang, to put out the fire. He decided to not say a word and followed Kuzuku and Goku anyways, leaving the god of destruction and his angle to themselves.

"Whis, you sensed that interesting fellow known as Black right? His Ki seemed to be Goku but yet not Goku, how strange," Beerus said, sipping his juice.

"Yes, strange indeed though we should warn them about the fact that messing or traveling through time is illegal," Whis replied.

"Yes, these mortals are too ignorant of the consequences it may have for their future or even the universe," Beerus scorned

"Hmm no, not exactly that Lord Beerus, its actually for another reason. Have you forgotten about her?" Whis said.

"Oh don't remind me, I don't want to ever think about that time ever again!" Beerus disgusted from a terrible memory that he had experienced in the past.

Back In The Future

Goku Black reemerged into the Future world as his time was up. He looked around to confirm that he had indeed returned back to the timeline he was previously in.

"It seems I do indeed have a limit but I at least absorbed some of Son Goku's being into me, making me even more powerful than befo-Graghhhh!" Black grunted in pain as the last blow Goku landed on him was more damaging than he'd thought. He couldn't keep control of his Ki for long and crashed towards the ground as he lost altitude. As he laid flat in the ground, he started to laugh.

"To think that the great Son Goku would be so hasty to unleash his godly power. Yes I can feel it slowly engrave itself into me," Black said as he was getting up. He punched the air, creating a gust of wind that destroyed several buildings. The villain looked at his hand for a moment a chuckled.

"This movement...it suits this body well," Black muttered, flying into the sky as he generated a energy ball in his hand. To test his new found strength, Black threw the ball at the ground, creating a large wild fire that engulfed the deserted buildings.

"Now that Trunks is gone, I can finally go forward with my plan without any interruptions! HAHAHAHAHAHAHAH!" Black laughed. But Black wasn't satisfied with this and decided another idea that would only further his evolution.

Back To The Present/Past

*CRASH!*

Kuzuku, had landed a firm and powerful kick in F-Trunks stomach, sending the future warrior into the side of a wall. Goku had already left since he was asked to go with Whis and Beerus to investigate, leaving the two of them to train. Straying away from that thought, F-Trunks had gotten up from the ground quickly, gasping for air but was ready for more. The two had been training for what seems to be hours on end, both in their Super Saiyan 2 states which actually astounds Kuzuku that F-Trunks had gotten that much stronger in such a rate. He couldn't tell what was more frightening, Goku Black or Trunks until he realized something completely out of the blue.

"Wait, I think I've got him figured out!" Kuzuku suddenly shouted. F-Trunks lowered his guard and walked closer to see what Kuzuku was talking about.

"What did you figure out?" F-Trunks asked.

"The secret to Black's power and why he seems to grow so much stronger in such a short amount of time," Kuzuku said

"Really?! Come on spill the beans!" F-Trunks enthused.

"Well, think about how we trained so far. How did you do at the start of training?" Kuzuku asked.

"Well both you and Goku were pretty much destroying me each time we were to spar. But what does that have to do with anything?" F-Trunk blinked with confusion.

"I remember one thing that Vegeta and Elder Kai told me. One way us Saiyans get stronger is the fact that when we recover from a near death experience or overcome a great struggle in battle. We call those power ups Zenkais. It's why our race is so feared and powerful since any injury given to us in battle will only make us stronger. What Black is doing is exploiting the Zenkais to further his strength. It's also the reason why you've pretty much already adapted so much that you are able to fight me in Super Saiyan 2," Kuzuku explained.

"Wait, if that's the case then why don't we just do the same?" F-Trunks asked

"Probably because its not that simple. As we know, we can't power-up through self-inflicted injuries and there is a consistency problem with this trait as to how potent a power-up may be or when it occurs. Plus its not like we have unlimited senzu beans stored up so nearly killing each other is not the way to go. Another thing is that we can't forcefully know when our bodies would have a breaking point and the fact that there is a possible limit to our powers as a Saiyan through Zenkais. This limit could only be broken through sheer training, thus making Zenkai unreliable up to that point. A Zenkai that shatters our limits are rare in some cases," Kuzuku said.

"But there is another way for him to probably exploit the Zenkais," Kuzuku added, catching F-Trunks attention.

"When God-Ki is incorporated into the mix, a Saiyan's ability seemingly become nearly endless in power. I am sure both Vegeta and Goku felt it to as well as I. When our bodies receive damage, we can always feel strength come back as we fight and our wounds seem to recover faster than normal. I theorize that this is what Black is doing but to a much further extreme. He not only abuses the Zenkai to a degree that I don't quite understand but one thing is for sure. If his growth was that rapid, then he must have God Ki, otherwise he wouldn't have recovered so fast," Kuzuku hypothesized

"I see, so there is no way to take away that insane boost from Black?" Trunks noted. Kuzuku shook his head to answer his question. Trunks smiled and jump back to power up even more.

"Then we just have to get stronger and surpass Black with everything we got! So come at me!" Trunks claimed. Kuzuku smiled and charged right back at Trunks, training him so he could fight the menace that dares to threaten his future.

Dinner Time

Everyone sat at tables on the balcony as they ate a large feast that was made by Bulma. The food was absolutely delicious and the desert was obviously good since 21 was eating them all. The sound of the door opening however caused those on the balcony to stare at the return of the two Saiyans that were training out somewhere. For some reason the younger Mai dropped her giant piece of food and blushed slightly, confusing the younger version of Trunks. Speaking of Trunks, the future one had changed his clothes to a more suitable stature such as a green sweater and new pants to match. The two sat down with everyone and began to eat. F-Trunks had begun to think that this was indeed the first time he'd genuinely sat down in peace without being on his toes at all times.

"So, how did training go? I can tell you two didn't go easy on each other since Kuzuku is all dirtied," 21 asked with a hint of care.

"It went well, right Trunks? I can't believe that you've gotten this strong already, you might be able to take on 21 or at least my sister," Kuzuku complimented.

"Well, it's all thanks to you Kuzuku and I don't think I would of gotten this strong by myself," Trunks smiled. There conversation was interrupted with the crash landing of none other than Whis and the two battle lovers. Everyone sighed as Bulma decided to walk towards the ledge of the Balcony.

"Did you guys find out who it was or was it just a dead end?" Bulma asked.

"No, I'm afraid not. Apparently it wasn't the apprentice Kaioshin from universe 10 after all. His Ki seemed similar but it definitely wasn't Black's Ki," Whis answered as he flew up with the other two following. Every went back to eating as they prepared for the next day.

A/N: Now you may be wondering about the Grand SSJ4 transformation and why couldn't Kuzuku just Zenkai boost himself into the form. The reason for this was because it was a Saiyan's limitation but a transformation limitation. In this chapter I mainly want to explain how Zenkai's work in this story since Zenkai's are inconsistently thrown around throughout the original dragon ball anime. For instance there are certain moment in the show that Saiyans don't gain a boost after recovering and moments when characters like Black get a Zenkai every single second. In a sense, I wanted to note that the best way for a Saiyan to get stronger, with or without god-ki , is through training rather than abusing physiology, as shown when Vegeta bodied Goku Black at one point, after he got out of the time chamber. Another note for this is because Black is a natural at God-Ki so his Zenkais are far more potent compared to any other Saiyan, hence why he is going to be formidable in this arc.