Chapter Summary: The BH6 team fight the masked man to save Tadashi, and finally revealed the criminal's identity.

Disclaimer: I don't own Big Hero 6 and its characters.

"Tadashi?" Aunt Cass called out to her nephew as she peeked into the room.

Tadashi was lying in his bed on his stomach. It had been a few days since he stopped attending SFIT and he couldn't sleep last night. His face was heavy and his eyes still stinging from tears that had long dried up. He didn't seem to hear his aunt since he kept staring at the memorial photo of Hiro sitting next to his face.

In Aunt Cass' hands was a red, portable suitcase (unknown to her, contains the inflatable robot Baymax) and it was given to her by one of Tadashi's friends.

"Your classmate Wasabi dropped by and asked me to give this to you," she said kindly as she set down the red suitcase near her depressed nephew's bed. "I don't know what this is, but he said you might need it."

She stared sadly at Tadashi, expecting him to say something. She was about to leave when he finally spoke.

"Aunt Cass, can I ask you something?" Tadashi asked. He sounds so tired and weak.

"Sure, sweetie. Anything."

"When mom and dad died in that car accident, you were sad, right?" Tadashi paused and then swallowed. He could taste a hint of bitterness in his mouth. "Let's say if you know someone who was responsible for their deaths, would you want that person gone for good?"

Aunt Cass became quiet and looked down at her hands. "To be honest, Tadashi... I would do anything to get my sibling back," she said hesitantly. "But wishing harm on someone, what good would that do? Holding on to that kind of anger... It's like grasping a hot coal and you want to throw it at someone else. However, you are the one who gets burned."

"I just missed Hiro, Aunt Cass," Tadashi said in a hollow voice.

Tadashi stared at Fred incredulously as he worked on upgrading a suit for the school mascot.

"Yokai?" he asked.

"Yeah, that's what we're going to name him!" Fred replied as he sat on the desk next to Tadashi's computer. "Every supervillain needs a nickname, and we can't keep calling him the masked man, forever."

Tadashi knew the name 'Yokai' seems to fit their masked man; someone who appears and disappears like a phantom, especially there's an air of mystery surrounding him. Yet, the inventor feels put off by the nickname.

"I don't know, Fred. Giving a criminal a nickname would make him seem like... human," Tadashi said with a shrug. And as far as I'm concerned, what he had done doesn't make him human at all.

Fred pursed his lips, pouting. "Well, if we're gonna be superheroes, we might as well make our origin story become authentic. We got the tragic backstory, a goal to protect people and stop crime in the justice, and super-secret identities!"

I don't exactly enjoy having a tragic backstory in our origin story, Tadashi thought bitterly as he continued working.

The masked man used the microbots to carry the unconscious Tadashi. He even removed the young man's helmet and left it behind. Moving quickly, he left the house with the intent of moving on to his next destination, bringing the intruder along. He heard something approaching quickly and he looked to see a giant, red-armored robot flying towards him fast.

Baymax was concerned when he sense Tadashi had been knocked and he realized he was ambushed by the masked man. This time, he got ready to scan the criminal while he prepared to grab his creator.

The masked man realized what the flying robot was going to do and he summoned a wave of microbot towards him. Baymax was struck and he fell the ground. Before he can get up, the microbots wrap themselves around his body and raised him high in the air. Then Baymax was slammed down hard on Callaghan's home, crashing through the roof and into the ground floor. Baymax lay there, unmoving though not broken. The masked man realized he just destroyed the house but he didn't care. He had more important business to attend.

He left the robot behind while carrying Tadashi in the tight grasp of the microbots.

Meanwhile, the rest of Big Hero 6 had meet up with each other in a deserted alley after making patrol rounds. So far, they have not located the masked man's whereabouts nor heard a word from their leader. Gogo couldn't get an answer from either Tadashi or Baymax in her communicator and she's beginning to worry.

"Something has happened to them, we need to find them," she told the others.

Honey gasped when she saw her visor blinking. "Tadashi's microbot tracker! The masked man is on the move!"

"He seems to be heading towards the pier, probably returning to the warehouse where we last saw him," Fred said. He's all pumped up to catch a supervillain. "We're coming for you, Yokai!"

"Wait, we can't go after that guy without Tadashi and Baymax!" Wasabi shouted in panic.

"You three go after the masked man," Gogo said. "I'm going to find the others."

"You know where Callaghan's home is?" Honey asked.

Gogo nodded. "I'm a bike messenger, I would know where to go."

Wasabi placed a gentle hand on her shoulder and gave her a worried look.

"You be careful, okay?" he said. "If anything happens to you to, I..."

"Don't worry about me," Gogo reassured him, chewing her gum. "Worry about how to get the Kabuki mask from that lunatic."

"That's not helping," Wasabi gulped in fear.

However, he, Honey, and Fred ran off in one direction to follow the masked man while Gogo sped off towards Professor Callaghan's home. She hoped she could find Baymax and Tadashi safe and alive.

Tadashi stirred awake. His head felt like it was ready to split open and his vision was blurred. He tried to move but he realized his hands were tied. In fact, he discovered he was tied down with thick ropes while sitting on a chair. His pain gradually began to fade and his sight clearing up. He found himself inside a dark room where the walls are full of the papers he remembered seeing in his first visit of the warehouse. He tried to see where he was but the only window in the room is boarded up. Tadashi suddenly realized he was not wearing his helmet; it must have been removed while he was knocked out.

In front of him, he saw the masked man standing over a table. The criminal had his back towards Tadashi and he seems to be fixing the neurotransmitter inside the Kabuki masked.

Tadashi remembered the video he watched earlier before he was knocked out and his blood boiled.

"Professor Callaghan," he growled.

His words caught the masked man who immediately put on the Kabuki mask back on his face before turning to look at Tadashi.

"You... you killed my brother!" Tadashi screamed. He struggled violently to free himself from the ropes. Right now he felt like punching the masked man until there was nothing like. All he could see is red and fire. "He looked up to you, he invented the microbots to impress you! And you steal them from him!"

The masked man said nothing but continue to stare at Tadashi coldly.

"I thought you were a good man, a great teacher," Tadashi continued. His chest was rising and he was breathing heavily. "But now I realized what kind of scum you are, you selfish monster!"

Then Tadashi was met by a sudden blow from the masked man's hand and he flinched from the sharp pain in his cheek. However, the inventor continue to glare at the masked man.

"When I get out out of these ropes..." Tadashi threatened him.

Then someone else spoke up. "Unfortunately, you won't," a female voice said. Tadashi recognized it; it belonged to the mysterious woman he hear in the warehouse. "In fact, you won't even be alive much longer."

Someone stepped into the other room, coming up from behind Tadashi. Tadashi's eyes widened when he recognized her.

"I know you," he said quietly in surprise. "You were with Alistair Krei at the showcase."

Krei's pixie-haired secretary just narrowed her eyes at him as she fixed her glasses.

"Where am I?" Tadashi demanded.

"You're trapped in the top floor of the old Krei Tech lab which is due to be demolished in two days from now," the secretary said coolly, crossing her arms. "I'm surprised you didn't drown after all when your car fell into the bay. You Hamadas have strange luck for survival..."

Tadashi interrupted her, "Why are you working with Callaghan? He wanted your boss dead!"

"Is that what you really think?" she asked. She has a strange smirk on her lips. "You just assume things from watching a single video without further understanding the truth. Our plans doesn't involve my boss, despite the careless mistakes he committed in his arrogance in the past."

"What plans?"

The secretary didn't reply. She went over to a cabinet and pulled out a thick roll of duct tape. Then she slapped a piece over Tadashi's mouth to prevent him from talking.

"If your little brother hadn't listened to Robert and should have sold his tech to Krei, he wouldn't had to pay for his mistakes," she whispered into his ear. Then she pulled back and gave him a blank, disapproved look. "This isn't personal, Mr. Hamada, but I am still miffed that you stopped Mr. Krei from walking with that microbot."

Tadashi just shot her an icy glare but the secretary isn't intimidated.

"Though we do have a couple of questions we have to ask you before we leave you here to die," she said. "The first thing we want to know is about your caregiver robot."

Tadashi was taken aback. Why would they want to know about Baymax?

Then the masked man seemed alerted by something and he moved towards the door. The secretary took this cue to leave Tadashi behind in the room.

"Looks like we can't have our answers then. This might be the last time we see each other," she told him. "I don't know if your body will be found or even recognizable after this building is destroyed."

Tadashi's angry screams muffled when she commented Hiro like that. But Krei's secretary ignored him and closed the door behind her.

Meanwhile, down below the abandoned labs, Wasabi, Honey and Fred cautiously walked around looking for any signs of the masked man. The microbot tracker had led them to a tall, brick building that used to be an old facility for Krei in the past. Fred began humming a tune to lighten up the atmosphere from being scary.

"Fred, this is not the time!" Wasabi said.

Honey hushed him gently as she opened a door which lead them to a huge, empty lab full of cabinets and high-tech desks of computers and keyboards that seemed to be covered in dust. The floors were covered in dust and small debris, as well as scattered papers. There is a huge hole in a wall on the other side of the room. In the middle of the room is a huge ring that seemed fifteen-feet tall and it looked like a portal. It looked old and damaged.

"I wonder what's this?" she asked as she touched the object.

"Guys, am the only one seeing this?" Fred suddenly spoke up. He sounded shock and he was staring at a piece of photo that he picked up.

Honey and Wasabi went over to where he is and looked into the photo as well. They gasped when they saw what's on it.

"Is that... that's impossible!" Wasabi exclaimed, his eyes went wide.

"This is too surreal. Why was he here?" Fred asked, glancing wildly at his friends.

Honey felt her beating fast. This is all so confusing. "We have to tell Tadashi..."

Suddenly, everyone's microbot trackers began to blink and beeped wildly before they fall into dead silence. They spun around around just in time to see the masked man and the microbots entering the lab through the giant hole in the wall.

"What's the plan now?" Wasabi asked.

Honey takes out chem-ball from her purse. "We get the mask!"

"No, seriously. What's the plan?!"

Fred suddenly stepped forward. "It's Fred Time!" he roared before leaping towards the masked man.

Meanwhile back on the top floor, Tadashi struggled to pull himself free but the ropes proved to be too strong. He had to get out of here and find Callaghan so he can destroy him. As well as Krei's secretary.

He wanted them both dead.

While his thoughts filled with hatred and fury, the wall with window broke down much to his surprise. As the dust cleared, Baymax stepped into the room and Gogo jumped off the robot's back.

"Tadashi!" she cried and hurried to his side. She quickly untied her friend.

Tadashi removed the duct tape from his mouth. "Gogo, thank goodness you and Baymax as here," he said, relieved. "How did you guys find me?"

"After I scanned you, we used my sensors to track you down," Baymax replied.

Gogo suddenly smacked his head much to his bigger surprise.

"Ow, what's the big deal?!"

"You cut us off and didn't tell us you were going somewhere else!" Gogo shouted at him while she keeps smacking his head and shoulders. "And when you didn't call back like you promised, you had us worried all sick! I even found Baymax lying on top of a collapsed house!"

"Gogo, I advise you to not hit my patient, please," Baymax stopped her. "He seems to sustained some injuries which I need to attend."

"Never mind about me," Tadashi said. "We have to catch Callaghan, he's the one who's responsible for the fire and Hiro's death!"

Gogo stared at him. "Professor Callaghan? That... Wait, that doesn't make sense..."

"My sensors told me the others are fighting downstairs and they are in trouble," Baymax suddenly stated.

Tadashi and Gogo hurriedly got on Baymax's back.

"Let's move, Baymax!" he shouted.

"Tadashi, there's something you must know about the masked man..."

"You can tell me later. Fly!"

Baymax then flew off to join the others.

Wasabi, Honey, and Fred-despite their new gear and skills-were losing a disastrous battle since they were still inexperienced. Wasabi had to slice and counter the microbots coming straight at him, but then he was grabbed by his feet and tossed away like a ragdoll. Honey took a chem-ball and was about to throw it at the masked man but Wasabi's body crashed into her. Her chem-ball was shot out of her hand and it hit Fred instead. The chemical concoction exploded into a gooey mess which got him stuck.

"Looks like we're in a sticky situation here, guys," Fred said.

"Great, we're going to die and the last words I'm gonna hear is a one-liner," Wasabi groaned in pain.

The masked man used the microbots to form a giant hand which then curled into a fist. The microbot-fist moved to strike the three heroes when Baymax suddenly flew in and broke through the fist with his armor.

The masked man was flabbergasted for a moment, but then he regained his composure when he saw Tadashi and Gogo entering.

"Baymax, look after the others!" Tadashi directed an order. "Gogo and I will take care of this!"

The masked man, now infuriated, used the microbots to form a giant snake and made it attack the two heroes. Tadashi and Gogo dodged away in time, and they split up. Gogo used her maglev discs and skated around the room faster, while Tadashi relied on his cable wires to maneuver around. The masked man realized he couldn't chase both of them at the same time so he made his microbots shot out spikes to try and attack them simultaneously. Gogo avoided them the best she cane while she threw the discs in her arms, hoping they will hit the Kabuki mask. She was then struck and she skidded to stop, crashing into the floor.

She tried to get up but she saw a microbot spike coming fast at her, she couldn't escape in time. She heard Wasabi screaming her name.

The masked man did not see Tadashi swinging down behind him. The inventor used his electrified glove and hit the masked man in the back. The latter's body twitched as electrical sparks coursed throughout his body. The microbots twitched in reaction.

Then the masked man was knocked down to the floor, the Kabuki mask flew off. Without the neurotransmitter, the microbots fell lifeless.

On the other side of the room, Honey and Fred were gently lifted up by Baymax.

"Baymax, buddy!" Fred grinned as he gave the robot a huge hug. "I thought we were goners, but you save us!"

"It's over... we won, Freddie!" Honey gasped with relief. Then, feeling rushed and possibly acting on the heat of the moment, she hugged the school mascot and planted a big kiss on his cheek. Fred's face turned bright red and he covered his embarrassed face with his kaiju costume. But Honey and Baymax already noticed he was grinning like an idiot.

Wasabi hurried over to Gogo's side. "Are you alright?"

Gogo groaned and clutched her side.

"I think so, but I've had worse injuries," she said. Her face softened a little when she saw how worried Wasabi looked. "At least you survived. Can't imagine what would have happened if Tadashi and I came too late..."

She stopped when she remembered their leader. Tadashi, meanwhile, had walked over the body of the rotten criminal, who was sprawling out on the ground. Sitting a few feet away was the Kabuki mask, and Tadashi picked it up.

"It's over, Callaghan," he said.

The masked man began to move, groaning a little. Then he began to stand up while he still had his back turned. The first thing Tadashi noticed something was off was the height of his enemy. He could have sworn Callaghan was taller...

When the masked man finally turned around, Tadashi felt as though he was smacked in the face. His eyes wide in confusion and his jaw dropped.

"Y-you're not Professor Robert Callaghan," he said in horror.

"No, I am his daughter," Abigail said coldly.

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Notes: Surprised by the plot twist? I've been wanting to do this twist ever since most of the Yokai reveal in fics are either Callaghan or Tadashi, and I wanted to try something new. I've had this plot twist planned from the very beginning when this story was just originally an AU oneshot in Tumblr. Another fanfic writer (who wrote the amazing fic "Twist of Fate") ALMOST considered using that Yokai!Abigail plot twist and I'm glad they didn't. XD

Why and how Abigail survived her portal accident and became a villain will be explain in the next chapter.