I usually don't do intros, but I feel like a bit of explanation is needed because this story started on tumblr where the audience already knew just about everything that was going on and I've had trouble adding the necessary descriptions in some places. Zaylee's non cannon slugs are as follows:
Lasa: species-Beamer, abilities- shooting laser beams from it's head
Snoop: species- Fimber, abilities- tracking and light source
Ilia: species- Invisius, abilities- turning things invisible
Styx: species- Vampenyeko, abilities- drains energy of opponent and opponent's slugs
Rexy: species- Dinorawr, abilites- hits opponents with it's rigged back for major damage
Spike: species- Acus, abilities- can knock a hole through any type of material.
The other two OC's mentioned on here (Xia and Pulse) belong to two of my best friends on tumblr, their characters belong to them.
Hopefully I explain everything else well in the story, so enjoy!

Zaylee was riding through Tusker Forks cavern when she heard the familiar sound of exploding slugs. That either meant a duel was taking place, or someone was in trouble. Either way, she wanted to be there. She pulled her mecha beast, a PAN-T3R model, around and headed towards the noise. She was not to be disappointed; she saw a group of slingers loosing sorely to Locke and Lode. She armed her blaster and took aim. However, a closer look made her stop short.

The black haired boy who appeared to be the leader of the group looked oddly familiar. She squinted, trying to get a better view. Suddenly she recognized the insignia they're all wearing. The Shane Gang.

That meant… Eli Shane. Her best friend when they lived on the surface world. They had always played together as kids when their dad's were working down here in Slugterra together. She felt a nostalgic smile creep over her lips, but she shook it off. That was ancient history. She knew how Eli would feel if she stole their thunder and sent Locke and Lode running. And they seemed to be doing fine anyways.

Or maybe they weren't, she corrected herself as she saw a cave troll fly across the valley into a rock, cracking it in two. She laughed a bit, but it must have hurt the blue creature, it took a lot of force to crack the rocks down here. She put her mecha into gear again as she saw a thin ginger girl, about the same age as Eli and a Molenoid get hit in the same shot, leaving only Eli standing against the brothers.

"Face it kid, you can't win." Locke said.

"Yeah, and even worse, you're gunna lose!" Lode chortled, adding his usual useless commentary.

"Don't pride yourselves so much, I've gotten a lot better." Eli defended.

Zaylee felt another smile cross her lips. He had grown up so much and in all the right places too. He was going to make a great Shane.

Locke and Lode shot two Hop Jacks at Eli and he countered with his Arachnet, but Spinner could only take out one of the ghouled slugs. The other hit him right in the chest and sent him flying with a thud to the feet of Zaylee's mecha.

"Need some help there kiddo?" She smirked.

"Nah, I'm doing fine." Eli choked out, struggling to get up. It was clear he had been hurt badly, bruises were already beginning to blossom across his arms.

"Right…" She said as he got hit by another ghoul.

She raised her blaster and shot her Dinorawr, Rexy, which hit Lode right across the face, knocking a tooth out. Next she sent her Rammstone right into Locke's chest.

"When did she get here?" Lode asked

"I don't know brother, but she's bad news for us."

"Miss me?" Zaylee smirked, reloading her bright blue and green blaster. "Better watch out boys, momma's home and it's time for a butt whooping." Zaylee chuckled, mocking their south western accents. She sent her Beamer slug after them and watched them hop on their mechas and run away as the laser-beam shooting slug chased after them.

"Thanks, we were really in a bind there." The cave troll said, coming from behind, still trying to re-adjust everything.

"Yeah, those are some really cool slugs you got there too." The red-head piped in. "I'd love to get a shot of some of them if you'd let me." She pulled out her camera, setting the focus.

Eli just looked pouty; Zaylee understood why. She'd been stealing his thunder ever since they started school.

"Well, it's nice to see we aren't the only ones who can shoot well around here." Eli said, a bit of malice still in his voice. "You do that often?"

"Yeah, I'd like to consider myself a vigilante, helping when I see the need."

"We were doing-" Eli began, but he was cut off by Pronto.

"Terrible, simply terrible, Pronto owes you the humblest of thanks."

Zaylee smiled appreciatively.

"By the way I didn't catch your name." Eli said, finally over his pride, and offering a hand in friendship.

Zaylee smiled all too knowingly. "I'm surprised you don't remember me Eli. But I'm sure we'll be seeing each other plenty." She winked at Eli's confused face. "In the meantime though, I have some clean up to do." Her Beamer had returned, looking tired, but triumphant and was hoping to her mecha. She held out her hand for the little slug and scratched its head in praise, before powering up her PAN-T3R and heading off in the direction where she had last seen Locke and Lode.

Eli watched her go off, his jaw slack. Trixie came up behind him, putting a hand on his shoulder to shock him out of his daze.

"Do you know her?" She asked.

"Uh, no, yes, I mean apparently, but not really, I have no idea…" Eli trailed off, racking his brain for where he had seen that face before. She looked familiar, but he just couldn't put a finger on it.

"Maybe she's helped us out before or maybe we've just ran into her on one of our patrols or something." Kord offered. "We've met way too many people to count."

"No, I'd remember a slinger like her."

"Allow Pronto to use his excellent snooping and tracking skills to discover her identity."

"No, that's fine Pronto." Eli muttered. "Let's just not worry about it. We were here to find that source you mentioned, not chase after Blakk's cronies and random vigilantes."

"Ah yes, my dear friend Pulse. She said she had much good insider information on Dr. Blakk, let us go, this way," Pronto said marching off, and straight into the side of a rock.

"Perhaps I may be mistaken," the Molenoid said rubbing his nose. He got onto his mecha and headed off in what the team hopped was only the right direction.

Zaylee blew the smoke off her blaster as she sent Locke and Lode into a full cry-baby retreat. It was too easy. Blakk really needed some worthy henchmen if he ever expected to be a real threat. Wait, no, no good henchmen, that'd be a bad idea, really bad. Nacho was more than a pant load as it was. She rode her mecha beast back to her own cavern, parking it in the parking garage that held all the mechas to her apartment. Climbing the steps to her apartment, she leaned against the door frame as she unlocked the five locks. Walking in she clicked on a button that projected a giant screen onto a blank wall. She then clicked a button on the screen, sending a call to her friends, Xia Akibba, Dana Pore and Erin Pulse.

"Hey what's up?" She heard Xia's voice on the screen.

"Wanna do dinner tonight? I've got quite the story to tell."

"Oh I love story time!" Xia smiled excitedly.

"How exciting," Dana stuck her tongue out sarcastically.

"Oh I have stories too." Pulse's Panthrope voice purred over the speakers.

"Wanna do pizza? Or this new sushi place opened up down in Low Rock Cavern."

"Sushi!" Pulse called.

"That sounds too classy," Xia stuck her tongue out.

"Trust me, you'll love it." Zaylee smiled pouring a bunch of slug pellets in a bowl and setting it down for her slugs.

"Alright, let's meet at seven then," Dana said. "Just don't get distracted with all that hero work like last time." She teased.

"As long as you don't get distracted with all your running for your life stuff." Pulse joked back.

"Hey, same goes for you." Zaylee warned. Her friends rolled their eyes at her before signing off to get ready.

Eli slammed his head on his wall for the thousandth time. Who was she? Why did she know him? She was so smug about it. Why wouldn't she tell him who she was? Did she expect him to figure it out? He slammed his head on the wall again.

"Hey Eli, man you sure you're okay?"

"Yeah no, everything's fine, just doing some re-arranging in here" He added a fake laugh, and went back to wracking his brain for the answer.

"Maybe you should go check on him," Trixie directed to Kord, "He's been all out of sorts since we ran into that girl this morning."

"He'll be fine, besides, we need to piece together all the stuff that cat-human-I-don't-know-what told us. She made no sense."

"It's all good information though," Pronto quickly defended Pulse.

"You're only saying that because you have the hots for her." Kord shot back.

"What? Pronto is insulted you would draw such conclusions."

"Dude, it was totally obvious the whole time we were there."

"Maybe you should go check on him." Trixie interjected again as she heard another bang from Eli's room. "His slugs seem all out of whack too. That's not a good sign." She protectively stroked a jittery Chiller.

"He's fine, let's just figure out this stuff." Kord brushed her concern off, instead holding up a piece of paper that held a snippet of Pulse's cryptic information. He turned the paper in all different directions, as if that would reveal a hidden message.

"It'd be a lot easier if we had Eli here to help us." Trixie said, acid dripping from her voice.

The sudden harshness in Trixie's voice made Kord and Pronto look up quickly. "Alright, one of us will talk to him," Kord tried to pacify the situation. "It's not really my strong suit though, I'm better with mechanics." Kord looked to Pronto.

"Although Pronto is sure he could handle the situation, he thinks a woman's touch is better suited here." He offered a weak smile to Trixie.

"Alright, fine you sissies."

Kord and Pronto winced under the insult and went quickly back to trying to decipher the pages as Trixie walked to Eli's room. Burpy hopped up and smiled at the two.

"I wonder why he's not bugging out like the rest of Eli's slugs." Kord mused.

"Perhaps… Uh… No idea."

"Maybe he knows the mystery woman. Hey little guy, what do you know?" He asked Burpy. The slug happily chattered his information to the Cave Troll and the Molenoid, both who understood nothing. They looked at each other for help, both shrugging when they came up with nothing. They looked back down at the paper, and Burpy, who was moving around the sheets in an order.

"Look!" Pronto exclaimed, pointing excitedly.

"They're making sense too!" Kord joined in the celebration. "Go little guy go!"

Burpy complied moving the last two pages in their respective places.

"Man you really are something." Kord said, rewarding the slug with a treat. "Eli's lucky to have you."

Meanwhile, Trixie was knocking on Eli's door, Eli refusing to open it.

"Eli, come on! It's not the end of the world! Let's just figure this information about Dr. Blakk out."

She received no response.

"Alright then, you asked for it." She loaded her blaster and shot a Hop Rock through his door, and then an Arachnet at Eli and promptly dragged him out of his room with the sticky web her slug had spun.

"Hey my door!" Eli complained.

"That's what you get, now come on." She huffed dragging Eli slowly down the hall. "Hey Kord some help?"

"Huh? I told you I was- oh, yeah I'm coming." He called seeing Trixie struggle with Eli's weight. He lifted Eli up and plopped him on the couch.

"And I'm assuming you two have done nothing productive," Trixie accused.

"Well, we didn't, but Burpy did," Pronto said motioning to the deciphered papers.

Trixie's face lit up at the organized papers and began to read them furiously. Eli was still muttering about the mystery woman and how Trixie had destroyed his door.

"You know what this means?" Trixie suddenly said. "We need to get to Blakk's fortress right away!"

"I didn't get that…" Pronto muttered.

"Do you think that's such a good idea," Kord brought up, "I mean, Eli's basically no better than a sack of potatoes right now…"

"No! We have to go right now! It says it all right here! He's going to launch an attack of ghouls with a huge army tomorrow! We need to get there and stop him before he has the chance!"

"Again, useless Eli," Kord pointed to the muttering Shane.

"We'll fix him on the way." Trixie said. She paused momentarily thinking and then with a grin said; "Maybe we'll even see her along the way."

"Were going!" Eli proclaimed hearing this, and got up and started heading to their garage.

"You're right Pronto," Trixie said, examining her manicure. "All it needed was a woman's touch."

Zaylee walked into the restaurant, absorbing the new atmosphere. She saw her friends sitting in a plushy round booth and rushed to join them. She barely had time to put in her order with the waiter before Xia was bombarding her with questions.

"Hold on, hold on, I'm getting there," she laughed taking a sip of her water. The three girls looked at her excitedly.

"Well," She began, "I ran into Eli today." She blurted out.

"What! No! You said we'd do that together!" Xia complained.

"Hey, it wasn't planned." Zaylee defended herself. "They were getting their butts kicked by Locke and Lode. It's my job to help people in need. And who doesn't love a good go at those two?"

"Fine, fine, you're forgiven." Xia sighed, grimacing momentarily at her Panthrope friend, Pulse, who was shoveling down the six plates she had ordered in what Zaylee figured was record time.

"So what'd you guys talk about?" Xia started up again, "When's you're first date?" She waggled her eyebrows mischievously.

"I call maid of honor!" Pulse exclaimed, pausing just long enough in the middle of her fifth plate.

"Slow. Down. Please. I didn't really talk to him, I mean, I mentioned that I knew who he was, but there were butts to be kicked, and his whole gang was there, and you know, I'm not good in social situations…" Zaylee twisted uncomfortably in her seat.

"We are so hooking you two up." Pulse said in between bites of fish.

"I don't even think we're friends anymore… Besides, he's more of a brother to me."

"I see that blush, don't lie to us, you know better than to be able to get away with that around us." Dana warned, pointing a chopstick at Zaylee.

Zaylee, still blushing under the dim lights began eating her food. "Tell us your story." She directed at Pulse, wanting desperately to change the subject.

"Well, your little story happens to segue into mine quite nicely, because after that, you'll never guess who showed up at my front door."

"What?! Has everyone met Eli but me?" Xia complained

"Nope," Dana shrugged.

"You don't count."

Dana was about to open her mouth for an angry retort about what the Shanes owed her when Pulse stopped the argument to continue her story.

"Well, I thought it was just going to be Pronto, you know, that nice Molenoid I met a while back at that party…"

"We're so hooking you two up." Zaylee mocked Pulse.

"Wait! You've known about the Shane gang for a while then and haven't told us?" Xia interjected.

"No, no, no. I had no idea Pronto was with the Shane gang! I honestly didn't think that was his style."

"His style? Really Erin?" Dana chuckled.

Pulse stuck her tongue out at the pink haired girl.

"He made it seem like he was the leader of some famous gang." Pulse looked away, embarrassed.

"From the thirty seconds I saw of the Molenoid, it doesn't surprise me." Zaylee chuckled.

"Finish the story." Xia prodded.

"Well, they came to me and Pronto said they wanted to ask me about my time with Dr. Blakk." Pulse paused and shuddered. Her friends waited quietly for her to continue. She did, but her voice had changed, "They asked a lot of questions, and I don't remember what they asked or what they said. I know I told them about the ghoul show Blakk's putting on tomorrow, but I'm not sure about anything else…" Pulse trailed off, clearly troubled; Xia put a comforting hand on her arm.

"We need to go there." Zaylee said suddenly. "Why didn't you mention this show thing before?" She asked Pulse quietly.

"You know me; I don't like talking about it." Pulse said, struggling to come back to her normal self. Zaylee nodded understandingly.

"We still need to go."

"Well you can," Xia said, "but I'm still trying to stay under the radar, so I think I'll sit this one out."

"I think I will too." Pulse said.

"You know I don't do that sort of stuff." Dana put in.

"I'll worry about it in the morning then. For now, let's just have a good time." Her friends smiled in agreement and decided to see who could eat the most wasabi without drinking anything.