Yuuki struggled as she tried to walk. She teetered and wobbled across a balance beam with Splinter following beside her until she turned her head and looked at him and asked "How long do I have to walk on this?"

Splinter replied, calmly "Until you've learn balance."

Yuuki frowned and replied "That's not very helpful." Then she let out an long sigh "I've done this a hundred times now. I think I'm ready for the next step."

Splinter turned around facing his back to her, silently, not answering.

Yuuki asked "Splinter?"

Before she could blink, the rat quickly spun around and threw his walking cane. Not expecting it, Yuuki fell backwards, as it hit her, knocking her off of the beam. She landed on the floor with a hard thud. Yuuki groaned and looked up to see the old rat standing over her looking down at her "Until you have learn this lesson then we will continue with the next step."

He held out his hand helping her up "That is enough for today."

Then turned his head to the brothers who were sitting the entire time watching "My sons, it is your turn now." Splinter left the training room leaving Yuuki and the brothers alone together.

Yuuki let out an frustrated sigh "I'm never going to get it right."

Michelangelo walked up behind her and wrapped his arm around her shoulders "It's just going to take a little time that's all. You'll get it! "

Yuuki asked "How long did it take you guys?"

Donatello answered " Well, me, Raph and Mikey eventually got it within two years. "

"And Leo?"

Michelangelo answered "Surprisingly, three. "

Yuuki looked at him surprised then back towards the blue masked turtle who was quietly meditating. I wonder why it took so long for him...

Michelangelo grinned and replied "Come on! I bet you're dying to see me in action!"

Raphael answered, sarcastically "More like make a fool out of yourself."

In the lair, Splinter lit a candle blowing out the match then turned around and faced the brothers while Yuuki watched. They were standing on bamboo poles. Splinter replied "My children, tonight our training will be focus on combining two essential disciplines: the way of balance" then he clapped his hands and the whole lair went black. The only light source were the candles, illuminated the dark. He continued "and the way of invisibility. "

Mikey looked at Donnie and asked "Dude, you put in a clapper?"

Splinter goes up to him and wacks the turtle on his hand with his staff "Ow! "

"Michelangelo, the way of invisibility, also includes the way of silence. I suggest that you want to employ both, if you wish to avoid my walking stick." Then he flips and jumps onto another pole.

He lands near Leonardo, and tries to hit him but Leo flips dodging the staff and lands on another pole. Donnie tries to attack Splinter. He ducks and the turtle lands on an pole instead. Raph does the same attempt his brother had done. But, Splinter dodges with ease. Yuuki watched in amazement watching the the rat master move fluidly with such grace and style. Next, Michelangelo flips and lands on a different pole. He looks around then clapped his hands, turning on the lights. He grins when he saw Splinter in front of him

"Peek a boo! I see you!" He grabbed the staff as Splinter attacked but the rat uses it to his are and throws him off balance nearly knocking Mikey all the way off.

"Hey, don't I at least get points for creativity?" Mikey asked

"A creative mind must be balanced by a disciplined body." Splinter claps his hands, turning the lights off, again.

"We must learn stillness and alertness for they are the only defense against the unexpected."

Yuuki heard some one call out "Hey guys?"

"Uh-Oh."

Then, she heard the turtles and Splinter let out a surprised yell as they were knocked down.

Yuuki was met with a huge weight as it collided into her. She groaned and slowly sat up squinting her as she could barely see in the dark. Her eyes widened in surprise to see that it was Leonardo. His face was so close to hers. Any closer and they would've kissed.

Splinter quickly turned his head staring angrily at the intruder who had invaded their home. He jumps and tackles the person, landing on top of them, knocking them to the floor. The brothers turned the lights back on and saw that it was Casey and quickly ran over to them.

Leonardo quickly replied "Master Splinter, no! He's okay!"

"Master Splinter, this is Casey. The nutca-uh the guy we've told you about." Donatello stammered out

"Remember, the vigilante?" Michelangelo replies

"We've figured it'd would be okay to give him access to the lair." Raphael said

'"you know for emergencies. "

Splinter got up and bowed in respect "Forgive my rash action. "

Casey took off his hockey mask answering him "No problemo."

Then Splinter pointed his staff at his head "Although next time, it would be wise to heed an ancient Japanese proverb "Phone first." and he walks away going to gather up the poles that the man had knocked over.

Casey noticed Yuuki looking at him "We haven't been properly introduced, Casey Jones."

Yuuki answered softly "Nice to meet you."

Casey looked over his should at Raphael and asked "Hey Raph, Is she always like this?"

Raphael answered "She'll open up when she wants to."

Yuuki frowned " You do know that I can hear everything that you're saying, right?"

Casey grinned "Finally something more than three words!"

Yuuki rolled her eyes and asked "So how's NANO?"

"It's doing alright. You know it's actually kind of cute when's it's not murderous rampaging machine."

Yuuki quickly replied "Hey, watch it. That's my kid you're talking about there."

Casey looks around the lair in amazement as he wondered around while accidentally kicking pole, to Splinters annoyance "Wow Raph! Your cribs even more awesome than you'd said!"

"You didn't come all the way down here for the nickle tour. What's the 411 street-side?" Raphael asked

"Graffiti. It's all over town... " Casey explained

"I think i speak for everyone in the room, when I say, duh." Mikey retorted

"We're New Yorkers Casey. We've seen graffiti before. " Donnie points out

"Yeah, tell us something that we don't know bonehead." Raphael replied

Casey shook his head "Uh-uh. Not this kind. I think somebody's trying to send you a message." then he pulls out a photograph. The brothers and Yuuki leaned in for a closer look. On it was a tag with the sword and four turtles being skewered on it. Yuuki backed away feeling a little disturbed by it.

"Blech! Talk about getting to the point!" Mikey exclaimed, in disgust

"Do all of the tags look like this?" Leonardo asked curiously

"Some are a little more graphic." Casey answered

He noticed a sword sitting on a stand and walks over to it "Hey cool sword. Looks just like the one in the graffiti. " He reached down to try and pick it up.

"Casey, No!" Donnie warned.

As he picked it picked it up, the sword let out a shock sending him flying into a bookcase.

Donatello looked at Raph and asked "Remind me, who's idea it was to invite him down here. "

The turtles, Yuuki and Splinter helped him up.

"I thank you for this information, Mr. Jones. But, now we must return to our training. " Splinter said

"Wait, don't you guys want to put the smack-down on the scum who did this?" Casey asked Mikey explained

"Well, yeah. But it smells way to much like a set-up."

"Someone's is just trying to get under our shells...or back. Why should we stoop down to their level?" Donnie replied

Casey pulled out his bat "But this is a matter of honor! What about all of that Bushidoodoo you guys are always talk about?!"

"That's Bushido. Which has nothing to do with payback with a bunch of nasty wall doodles. " Leo pointed out

"Sorry Casey, but I gotta go with my bros on this one." Raphael answered, smiling.

Casey put away his bat until he noticed a multi set TVs. "Say..." He sat down on the couch eating a slice of pizza

"Say, what's on the tube?" The brothers and Yuuki stared at him bewildered.

Mikey reached over for the last slice of pizza but Casey grabbed it before he could. Casey sat down going through a box full of DVDs. Leonardo approached them turning off the TV and yawned "Woo, sure is getting uh late" Casey had been there since he had arrived, and everyone was getting annoyed .

"These the only DVDs you got?" Casey asked, angrily

" Yeah, in fact, why don't you borrow some and bring them back?" Mikey quickly replied

Casey walked over to the DVD player "That's okay. I'll just watch them here." He answered while trying to press the eject button "Come on! Eject, Eject! You useless piece of -" He slams his foot on it breaking the DVD player while Leonardo, Yuuki and Mikey stared in horror.

"Uh, I think your player's broken." Casey replied, nervously

"Uh no problem. I'll fix it. In the morning?" Donnie called out

Casey walked over Donnie 's work station. He over the turtles shoulder "Whatcha working on?"

Donnie quickly covered it up and answered quickly "Boring stuff! Really boring stuff."

Casey turned his head to see Raph punching with his punching bag. He quickly runs over and tackles the turtle to the ground "Hey Raph. Let's wrestle!" They rolled around in the floor trash talking each other until Splinter slammed his staff down in front of the

"Raphael, normally I discourage excursions to the surface, but I think it's wise to take our "guest" out for a breath of fresh air and take Yuuki home as well."

" Topside! I'm all over it! " Raphael exclaimed

"Booyah! " Casey shouted

"Come on, you maniac." Raph commented

" Maniac? Who you calling a maniac?" Casey retorted

On the surface, Raphael, with a slightly terrified Yuuki on his back, and Casey flipped across the rooftops trash talking each other.

"Nim rod! "

"Lightweight!"

" Geek-face! "

Casey paused when he heard a sound nearby "Spray paint?"

"Spray paint? What kind of lame trash talk is that?" Raph asked

"No, listen." Casey said. They looked down from the rooftops to see three purple dragons tagging a wall with a dragon devouring four turtles. Raphael set Yuuki down then turned to look at her "Wait here and I mean it. " Yuuki nodded asking no questions. Raphael smirked the rubbed her head "Good girl." She knocked his hand off.

Raphael and Casey dropped down between them " Hi, we're the neighborhood clean and green. Doing our part to stamp out taggers. " Raphael growls as he sees a dragon come at him with a chain. He dodges and kicks them aside. Casey's another holding two baseball bats "Dude you're totally stealing my act. "

As they were fighting a third thug quickly took cover behind a dumpster and pulled out his phone "We got one." As he finished, Raphael grabbed him and three him against the wall. Yuuki watched quiet impressed as she was Rap h and Casey easily defeat the other two dragons throwing them into a pile together.

"Piece of cake." Casey commented

" Don't be so sure. Phone boy called for back up. " Raphael replied as he saw two ninjas drop down from the rooftops "and here it comes."

"Whoa! Those things aren't human!"

Raphael twirled his sai "In case you haven't noticed, neither am I. " They charged at them, only to find that they completely vanished.

"Where'd they go?!" They both were knocked back by the invisible ninjas.

" They must have some kind of, what do you call it, Cloaking device?" Raphael groaned as he sat up

"Cloaking device? What are they, Klingons?" Casey questioned

Raphael sees one of the invisible ninjas walk through a puddle of water and jumps at them. But was caught instead as they grabbed his belt lifting him into the air. Casey quickly grabbed the spray paint lying on the ground next him spraying the ninja with hits them with his hockey stick causing the to drop Raph and one of their orange eye device to fall off. He tried to attack the ninja again but it grabs his hockey stick.

Casey's eyes widen "Uh-Oh." Him and Raph were tossed into a scaffolding knocking them both unconscious.

Yuuki watched in horror as she witnessed what had happened. She turned her attention towards the ninjas, only to see one of them had vanished. She heard a puddle splashed from behind. Her eyes widened and she quickly turned around to see the ninja with one of its eye pieces knocked out. She reached into her coat pocket and pulled out the taser gun, and made a quick rush at the invisible ninja. But they quickly intercepted it and grabbed her wrist, painfully twisting it. She shut her eyes and screamed in pain as they pulled her arm behind her back, making her drop the taser to the ground. In a flash, her vision went dark as she felt a sharp jab on her neck.

"Targets apprehended."