AN: Alright! This is the start of the Thunderhead sequel, Defender of Arkham City. On side note, there will be some other characters I will introduce another OC when I get the chance. Please review and enjoy

Disclaimer: I do not own Shadow, Breeze and Dusk. Only Shadowknight1121. The same goes for Sarina Gibson. She is own by Tonycakes. And if this offends said authors, I apologize.

Chapter 1: Welcome to Arkham City

Months later in a maximum security prison composed of the narrows, was Hugo Strange's Arkham City. A upgrade for Arkham as others would call it Arkham Asylum 2.0, with prisoners from Blackgate prison and Arkham Asylum were now prisoners of Arkham City itself. And inside Arkham City itself, was a brewing gang war. With criminals such as the Joker, Penguin, and Two-face making their mark. And with the addition of Roman Sionis, known mostly as Black Mask was put in prison he was ready to set up shop with his henchmen and new recruits. And word had just spread that the dark knight himself, Batman was now in Arkham City and everyone began to wonder why of all was he here in the first place. He wasn't the only one in Arkham, Ethan Louis aka Thunderhead had made the scene into sneaking in Arkham City as he brought himself riding along his ice slide. He landed on a nearby rooftop, wearing his black bodysuit with his blue jacket. The same thunderbolt logo on his chest, with yellow stripes on the bottom of his bodysuit. Ethan then put his hood over his head as he kneel down on one knee staring at Arkham City.

'Of all places, why would Batman come here? Then again, he is the goddamn Batman. He always thinks something is going on.' he thought as he ice launced into another building, while getting a quick glance of a hooded man wearing a black and white outfit with a red cloak. 'Don't know who that was. Doesn't matter.' Ethan thought, finishing as he caught a glimpse of a accused citizen being beaten by Arkham inmates wearing black skull masks and jet black jumpsuits. 'Time to kill some ass.' I thought, jumping one of the Black Mask's thug with a smirk appearing on my face. "Whose first?"

"Hey, it's that Thunder freak! Get 'im." one of the thugs as a water-like whip caught all three of them, encased their bodies in water as the water quickly turned to ice. "He-hey! We can't move!"

"That's the point, dumbass." Thunderhead retorted, smirking as the thugs were stuck on ice while Ethan went over toward the civilian. "You alright?"

"Yea-yeah. I'm fine." the politic prisoner stuttered, trying himself warm in the cold air. "It's a good thing you came by when you did. Black Mask's thug would've killed me from the start if I didn't help Roman Sionis."

"Why help Black Mask?" Thunderhead asked. "He's already in Arkham City because Strange double-crossed him. Same going for anyone else innocent."

"Well, word is that there were these criminals arrested here." the captive politic stated, handing Ethan a paper of the assassins. "This a photo of each of them. Take it. I got them off from the dead corpse of a TYGER guard."

"Thanks." Ethan said, placing the photos in his jacket pocket. "In the meantime, get somewhere safe." he finished as he fled away someplace else using his ice sled power, landing on a rooftop a couple blocks away in the process. Thunderhead pulled out the photos of the recent assassins. "Let's see who's on this list." Ethan turned to the first photo that showed a bandaged man wearing a trenchcoat, his name was Hush. 'Don't know who this guy is.' Ethan thought as he flipped over to the next one that showed a man wearing a pilot outfit that came with a jetpack, using a flamethrower. 'But this guy I heard of. Garfield Lynns aka Firefly. Burns over 90 percent of his body. Dude's an aronist.' the third was a blonde haired woman with tan skin, yellowish snake-like eyes and had tattoos that appeared on her cleavage. The fourth one he knew was Floyd Lawton aka Deadshot, one of the world's accurate marksman assassin. The fifth was a hot asian chick wearing a black jacket over a red robe and black leather pants, along with a 'don't screw with me' look. He knew this woman was Lady Shiva, remembering their encounter at one point. And the sixth he knew of was Anarky, wearing the white opera mask and red plush hoodie jacket that a white A on the front. 'I think I call the Bat and see what he knows about these guys.' Ethan touched the small communicator on his ear, getting Batman's signal. "Batman, this is Thunderhead. I've come across some criminals that just arrive at Arkham City recently. I know a few of them as Firefly, Deadshot, Shiva and Anarky, but I don't know the last two."

"Who are they?" the dark knight himself said

"One of them is name Copperhead." Ethan replied, staring at the photo of the blonde haired woman. "But everytime the word Copperhead appeared, the reports were reference to a male not a female. There's also some guy name Hush. You know anything?"

"I've encountered Copperhead once." Batman stated over the communicator. "Be cautious of her venom neurotoxins. And as to who Hush is, I don't know anything about him. Stay vigilant."

"Will do. Wait, are you in Arkham City?"

"I am. And I need you to find out if they know about something called Protocol 10."

"What the hell is Protocol 10?"

"I don't know. Joker may be behind this."

"And if the clown's not?"

"Then, I'll go find Strange. He'll know what it is."

"Hugo Strange?" Ethan replied, in sudden confused. "What the hell is this guy planning? Black Mask's already in here, judging by the thugs. There's a rumor that Sionis is setting out on Zeus Casino. I'll start there."

"Good. One other thing," Batman paused for a short moment. "I'll have Oracle give you the details. In the meantime, go see if Sionis knows anything."

'Roger that, Batman." Ethan said, flicking the communicator off as Thunderhead head for Zeus

Zeus casino 9:12 p.m.

Thunderhead stood above a rooftop of armed thugs guarding the entrance, front of back with two men in position. On the front entrance of Zeus Casino, Black Mask thugs were firing on Two-Face and Joker's gang while Penguin a minute later. A TYGER chopper hovering above the scene as the light pointed at Thunderhead, who in return sighed in annoyance. All guns were aiming straight at Thunderhead, with Ethan cracking his knuckles as he lifted his arms up in the air.

"I..." he paused as a large stream of water formed above the him, with each of the bullets hitting the waterfall stream. "Hate..." he trailed off as the large stream of water from below was now forming into a tsunami. "TYGER." he finished, growling with the tsunami washing away the gangs of Joker, Two-face, Penguin and even a four men squad of Black Mask's thugs.

The TYGER chopper moved away from the twirling tsunami in the diversion, only to set the light back at Thunderhead who had vanished afterward. Ethan landed on a hard ice float as he moved forward to the back exit with his water surfing ability, while he climbed up the ladder that lead to the back door exit. He stepped in and closed the door behind him, while inside he walked and glance around making sure there were no camera. Fortunately, there weren't as Thunderhead made his way upstairs catching a glimpse of a four men squad patrolling the casino. Ethan conjured a small line of water from a nearby water fountain as he lashed it out at Black Mask thug patrolling beside the slots, encased his face in water as he was sent flying back to a wall freezing his mouth and body on impact.

Thunderhead moved ahead, ignoring the muffling thug trapped toward the wall as he performed a sleeper hold technique on the second thug he tackled. He tripped the third one with a leg sweep and sent a blow to his head, knocking him unconscious. The sound of the knocked out member of Black Mask's gang caught the attention of the last thug as he ran over to the direction of the noise, aiming his gun at what trouble laid ahead. The thug ducked out of cover, only to receive a electric zap on his neck from behind as he was faded into unconsciousness. Thunderhead slowly went up the stairs as he knocked on the door that laid to the office room, presumably were Black Mask would be setting up how to take any terriorities Joker, Two-face or Penguin took recently.

"Time to call in the man himself." Ethan muttered as he slammed his fist on the door hard, repeatedly with an angry Black Mask answering it

"Ah Dammit! What the hell is it this!-" Black Mask is cut off when Thunderhead froze his torso toward a door. "You!"

"Hey, Roman. I see that you set up shop here in Maximus Zeus' casino." Thunderhead said cooly. "I hate to barge in, but what do you know of something called Protocol 10?"

"What the hell are you talking about?" Black Mask said to Thunderhead in utter confusion

"I'm taking about Protocol 10." Ethan replied. "Didn't your buddy Hugo Strange tell you anything about it?"

"Strange? Like that bastard would tell me anything." Sionis retorted, spat on a dead plant nearby. "I gave him the money to fund whatever he needed. Same went for Sharp himself. And when he had the money, that sonuva bitch crossed me! He's my kill! Not yours or anyone else."

"Well, he fooled you." Thunderhead joked. "See ya." he finished, only for a bullet to fly in the direction close to Ethan. "Alright, who's the guy that tried to yours truly?"

"That would be me." said a unknown male voice. "And who says I'm only here to shoot you."

Thunderhead glanced at the direction of the voice, seeing only a shadow figure to emerge from the shadows. He was wearing a black outfit and a brown trenchcoat, along with his entire face bandaged showing his green eyes. The man had a .48 auto pistol in his hand, cocking the safety as he aimed the gun at Thunderhead and Black Mask. And at that moment, Ethan knew who this man was. The mysterious man known as Hush, still aiming his pistol at both of the two. Ethan dashed forward shot a alpha bolt at Hush, who in return dodged the electric blasts as he fired off several bullets toward Thunderhead's direction. He avoided them all, except two shots to the arm as Ethan took cover around one of the slot machines while Hush circled around the slot machines to corner Thunderhead. While Hush was searching for his target, Thunderhead was using healing power on his arm as water rushed around his entire arm. Ethan heard a sound coming from behind as he moved, charging his hand only to see nothing. But suddenly, he heard a gun cocking behind his head as he tried to arm at Hush. However, Hush grabbed his other hand with intense strength suddenly. It started to feel familiar, it felt like Bane. Then Ethan sum up that Hush must have been induced to TITAN, the same that could turn someone to a Bane like monster. But it looked Hush only took a small dose of TITAN.

"I wouldn't if I were you." Hush stated, still pointing his pistol at Thunderhead's head. "One move and bam! You're dead."

"Quick question, did you dosed yourself on TITAN?"

"Only a small dose."

"I see." Ethan paused. "Can we settle this with some dignity? My superpowers and you enhanced with TITAN?"

Hush narrowed his eyes at the elemental hero, still keeping his pistol on the back of Ethan's head. "No deal. I'm sorry about this, truly I am. This is just business."

"So is this." Ethan countered as a the casino started to shake

Hush heard rumbling coming from below as a stream of water collided toward him, slamming him up a ceiling. Thunderhead conjured the water to cover Hush's entire body as he encased the bandaged man's torso, leaving him stuck in a Zeus statue behind him. Thunderhead went up toward the trapped Hush, only for a flashbang grenade to drop and explode showing a blinding light. Ethan started to become blurring as he noticed a group of TYGER guards, their assault rifles armed at him. With a snap of his fingers, Thunderhead disrupted the guns of the TYGER guards as he sent out a barriage of punches and kicks at the confused TYGER guards. Once he dealt with the guards, he found out he already fled the scene while Ethan was occupied by the TYGER guards.

"Well that's suck..." Thunderhead groused, staring down at a communication radio as he broke the cover and grabbed the micro chip inside it. "Okay, now to see who sent these TYGER rent-a-cops here. But how am I going to do that?"

"I think I can help." a display appeared inside Thunderhead's goggles, revealing a red haired woman wearing a purple track suit with yellow stripes. A sudden grin appeared on his face as he knew who the woman was.

"Oracle! Aren't you a sight for sour eyes, beautiful." Thunderhead said in a flirty tone as he left Zeus' casino, water surfing toward through Arkham City. "How you doing, baby?"

Oracle giggled. "I'm fine, Mr. Shameless Flirt. Now where was I..."

"You were helping me find out whose sending TYGER forces on me."

"Oh, right. Place the chip in your communicator." Oracle said as Ethan did so. "Hmm, apparently Hugo Strange's got his eye on you."

"Why? Why would Professor Baldy want anything to do with me?" Ethan replied confused, landing on the roof of the courthouse. "Isn't he suppose to I don't know, spy on super criminals, Batman or something?"

"The creep still is. But Batman's with Shadow following a lead on Joker."

"Shadow? Dark hair, longsword, dressing up in a combination of Batman and a gothic soldier boy?"

"Yep."

"Huh. Can't believe those two are working together." Ethan snorted. "What about his girlfriend Breeze and that kid Dusk? Where are they?"

"Breeze is with Catwoman and Dusk's with Robin."

"I wonder if Breeze is a Catwoman fan." Ethan muttered, glancing down at a hispanic man with brown hair and hazel eyes. The man was at least Ethan's age, carrying two small swords in his hand. He was wearing a jacket with ninja armor underneath his jacket, following a hooded woman. They walked toward a dark alley left of the courthouse. "He looks familiar. Like I've seen him before."

"You have." said a mysterious male voice, which caused Thunderhead to quickly turn his head toward the direction of the man and hooded woman revealing herself as Lady Shiva. "And before you use your power, our beef is not with you. I'm here to give you a message."

"What message?" Thunderhead said in a direct tone, narrowing his eyes at the hispanic man and Lady Shiva

"Arkham will burn." he said as he threw down a smoke pellet on the ground as him and Lady Shiva vanished out of thin air

"Thunderhead? Thunderhead! Ethan!" Oracle said, snapping Ethan back into reality

"I'm here, Barbara." he stated

"What happened?" Barbara asked Ethan

"I don't know. I saw Lady Shiva and she wasn't alone." he replied. "Who was that guy?"

"Ethan, I got a lead on Deadshot!"

"Where is he?"

"Jezebel Plaza. Near Penguin's hideout."

"I'm on my way, Barb." Ethan stated, ice surfing to stop Deadshot