Donnie woke up the following morning, feeling somewhat relieved; a different feeling being felt since the past few weeks being stuck in his lab. Even though he still vividly remembers what happened last night, Donnie has the gnawing feeling that he left something out. He got out of his room and was surprised to see that the other doors were still closed.

He approached to Leo's room and silently knocked his door. Leo opened up the door, dressed in his blue Captain Ryan robe and without his mask, bindings and kneepads.

"Can it not wait Donnie? Do you even know what time it is?!" Leo grumbled as he rubbed his eyes.

"I really don't think so." Donnie replied, placing his bo between the door to prevent Leo from shutting the door.

"What is it?" Leo grumbled as he leaned on the door with his arms crossed.

"Two things. First I want to do is apologize to you about last night. I know it has been a long time since we talked to each other and I have no right to talk to you the way I did last night." Donnie stated in an awkward, poker face style. Leonardo still seemed unfazed even though he had a raised eyebrow.

"But, I found some stuff yesterday in my investigation that you might find interesting." Donnie finished.

"And you're telling me this because?" Leo replied, still seeming unconvinced like the past evening.

"I think you might understand it more than Raph or Mikey." Donnie replied in the same awkward, poker face style.

"Fine. Meet you in the lab?" Leo sighed

"In 10" Donnie replied

"Man you are so twisted sometimes." Leo grumbled as he closed his door.

"Hey! I thought Raph had that label." Donnie yelled back.

"Everyone has that label except for Splinter." Leo yelled.

Donnie was furiously typing on his laptop and printing out some papers when Leo arrived with two cups of herbal tea and looked upon some of the analysis. He had to admit he was stunned with how different the lab and equipment looked. The only thing that remained the same was the frozen form of Timothy.

"This all validates your "twisted" side Donnie." Leo chided as he slid Donnie's favorite cup towards him.

"Just shut up alright." Donnie yelled frustratingly, organizing all the analysis and throwing them to Leo to read. He noticed the cup of hot tea and started to drink it.

"Thanks." Donnie replied, getting a "you're welcome" shrug from Leo.

(5-10 minutes later)

"So this thing or person is a female and are you really positive that its not related to the Foot or Kraang?" Leo asked. "I mean who else might have the technology for teleportation or travel to cause this energy?"

"I know. April told me that when she first saw it, she saw random burst of electricity being shot out, but like I said, no Foot or Kraang were in the area." Donnie replied back while looking upon the databases.

"Interestingly, you didn't even encounter any one of them, when you came back, like what 5 minutes later?" Leo replied confusingly. Donnie just nodded as Leo flipped over more of the analysis papers.

"Whoah." Leo said in a flabbergasted tone.

"What?" Donnie replied looking up from his main computer.

"Just two things. How on earth can a portal disperse that much energy in just a few seconds and still remain there moments later when you arrived, and an Obsidian blade that sharp to make a deep cut on thick, solid concrete?! Nothing of this adds up Donnie." Leo grumbled as he threw the analysis paper back to Donnie.

"Or it could be that new group." A deep voice piped in.

Both the brothers looked up to see Raphael walking towards them. Just like Leo, he was without his mask, bindings or kneepads.

"Really? A team meeting without everyone in it?" Raph chuckled as he sat on the old stealth bike.

"Not really a team meeting, Raph." Donnie replied.

"SO what is this new group you're talking about Raph?" Leo asked.

"One night during patrol, Casey and I got word about a Kraang location and the possibility of suspicious activity. When we got to the place, we noticed a few large black cars parked in front of the shop. After waiting a moment, we saw different men dressed in black coming out. Like no joke, they were armed to the teeth." Raph muttered, looking pretty nervous.

"Did they have guns or something bizarre?" Donnie asked, sipping his tea.

"Nah, it was mostly hand-to-hand weapons. But one weapon of there's really stood out. They carried these kind of escrima sticks, but the tip was glowing, kinda like its plasma or something." Raph said.

"Wait a sec, did you or Casey saw any writing on the cars? I doubt the FBI or CIA has access to that type of weaponry or authorization to search and destroy all Kraang operations." Leo asked.

"Yeah, Casey saw something like EPF, Earth Protection Force. They wept the whole place clean like they really took every single brainey-toy things and their android suits, and their tech." Raph said. When looking at Leo and Donnie, the two were looking at him very strangely.

"What?" Raph asked.

"Its really strange to listen to your verse of techno babble because Donnie is the only one who could be able to do that." Leo chided. He looked at Raph whom was doing a fuming kind of look.

All of the sudden, Donnie just bolted up and made a beeline for his Bo/Naginata and Detective Vision. The two looked at Donnie in a rather stunned and perplexed way. Later, Raph just shrugged and walked out of the lab and back to his room.

"But we're not even done with all of this yet." Leo exclaimed to Donnie.

"I know. I'm just heading back to the alley and check whether if our "visitors" left us even more clues." Donnie replied back.

"But its day time right now, shouldn't you just wait?" Leo started to yell. But it was to no use, Donnie already left the lab. Surprisingly however he left his computer on. Leo strolled over to see what Donnie found. Apparently, he found a local report of the sightings of a strange, dark clothed warrior that happened during the night and the last known location was somewhere near the TCRI building. Leo recognized the place because it was the team's first encounter with Baxter Stockman took place.

"Great." Leo yelled in an exasperated tone and ran back to his room. He quickly tied up his bindings, kneepads and mask. He just grabbed a katana and ran after his sometimes impetuous brother.

"Alright then where are you?" Donnie muttered to himself as he drew out his Bo staff, walking cautiously around the area. Secretly however the dark warrior was hanging atop one of the fire escape stairwell, making quick movements as it follows Donnie.

Donnie activated Detective Vision to find any booby traps in the area, but the alley was clean. When he turned on the Environmental Scanner, he noticed a symbol similar to the one found the previous evening. He slowly walked up and started to rub the dust off the wall. Upon seeing the symbol, it started to glow with a blue light.

"Oh no." Donnie muttered as he quickly rolled out of the way. When he got up, the symbol shot out a burst of electricity that would've fried Donnie if he didn't have quick reflexes. After the trap was triggered, the symbol just disappeared.

"Looks like you don't fall so easily." A random guttural voice was heard. Donnie immediately picked up his Bo staff and deactivated Detective Vision.

"Who's there?!" Donnie yelled as he backed up to the wall. He swore that he heard a mix of giggle or chuckle.

"Here."

Donnie heard the same voice, but this time it was a whisper to his ear. Donnie immediately spun around but sighed when it was just a wall.

"Must be my imagination or lack of sleep." Donnie muttered as he turned around.

All of a sudden, the Dark Warrior jumped from a nearby fire escape and swing kicked Donnie's face when he turned around. Donnie's back and head slammed hard against one of the large garbage bins. Wincing, Donnie managed to get up with the aid of his Bo staff. In front of him was the culprit likely responsible for last night's incident. It was dressed in a black, skin tight suit with symbols of the black and white bird symbol. It had a dark cowl and mask that completely conceals the person's face. The only thing he could see were bright, stormy blue eyes. Donnie noticed a loaded quiver, bow and a random array of blades.

They circled for a while until they stopped.

"Who are you? Are you a part of EPF?" Donnie asked to the dark warrior.

"I don't have time to explain what I don't have time to explain." The warrior replied as it reached behind itself. Donnie immediately threw a couple of shuriken, but was astonished when the dark warrior simply dodged them with an aerial.

"You're going to regret that." The warrior muttered as it pulled out two obsidian swords. One had intricate carvings with the blade donning a strange curve. The other sword was straighter but had the same markings as the warrior's outfit. However it was glowing with a strange red and green aura.

"Not unless we play fair." Donnie replied sarcastically when he pressed the secret button and turned his Bo into a double bladed naginata and twirled it around his back. Even though he couldn't see the warrior's face, Donnie could imagine a scowl forming on its face. But the thought was cut short when it charged at him.

Donnie was successful at keeping the warrior at bay thanks to the staff's reach. But this warrior was really feisty, constantly looking for a weak spot to engage Donnie in close combat. Moments later, Donnie managed to disarm the warrior and got in a lock with her other blade.

"I'm not here to hurt you. Who and what are you? Donnie asked in the form of a snarl.

"Not a chance, Argonian." The warrior growled back.

The foreign word caught Donnie completely surprised that he was unaware that the warrior disarmed him. The warrior quickly sheathed its blade and started to give him a beat down. When the warrior missed a jab, Donnie wrapped his left arm around the warrior's right arm and brought it in for a massive head butt. The impact somewhat disoriented the warrior giving Donnie the opportunity to perform a flying kick. He did just that and the warrior collided against the brick wall. Donnie walked over to his Naginata, splitted it in half and threw it, aiming it towards the warrior's head. The blade struck the wall deep and a few inches above the warrior's head. Donnie used the distraction and charged the warrior.

As Donnie threw a punch, the warrior quickly jumped and grabbed on the stuck naginata piece and countered with a kick. Two more kicks ensured until the warrior got Donnie on a chokehold. Donnie's constant flailing caused the piece to loosen and the warrior fell atop on him, knocking Donnie out. The warrior grabbed and lifter Donnie's head up.

"Your life ends now." The warrior yelled and was about to stab Donnie.

Leonardo came out of nowhere and speared the warrior away from Donnie. He quickly got on top of it and punched it, knocking it completely out. He looked around and saw the area of the scuffle. Donnie made a loud groan. Leo made a quick run to his side.

"Take it easy champ." Leo said "reassuringly".

"Man, did we lose it?" Donnie said as Leo gave him a hand.

"Nope, its still there Donnie." Leo pointed at the black hump on the ground.

Donnie rolled it over and saw the warrior pretty much out cold. He was hesitant in removing the cowl of it so he decided to put a finger at its neck to feel a pulse. All of the sudden, Donnie just froze.

"What's the matter Donnie?" Leo asked worryingly as Donnie got up looking rather spooked.

"Two things. I felt a pulse so it's alive and breathing." Donnie said but looked uncomfortable.

"And?" Leo asked.

"It's a human. Female." Donnie said as he cleared his throat.

"A vigilante of some sort maybe." Leo said as he inspected the body more closely.

"Maybe. She said something about Argonians. Ring a bell?" Donnie asked, picking up the remnants of his staff and the warrior's obsidian sword.

"Never heard of anyone called Argonians. I don't' think that Raph has either." Leo replied picking up the body like a broom and bride.

"What are you doing Leo?" Donnie asked.

"Investigate and Interrogate. Let's get a move on before anyone sees us." Leo said as he jumped to the roof of the building with Donnie nearby.