The Castle of the Kobra

Episode 50 of Nightwing & Batgirl.
== Plot ==
Black Manta gave Kobra the green light to go and attack Aquaman. Now, Kobra and his followers headed to their new castle, situated near Atlantis. He relayed a message to Aquaman using his supercomputer. 
"King Aquaman of Atlantis! I challenge you to a duel here in my castle.", he said. 
Through a communicator, Aquaman replied, "Oh, great. Just when I thought my day was going perfect." 
"Come here and let's make it perfect.", Kobra replied. 
"Cool. Or else what?", Aquaman asked. 
"Do you know where my new hideout is?", Kobra asked. 
"Where?", Aquaman said. 
"Near Atlantis. You don't want your precious city be blown into pieces right?", Kobra said. Aquaman was stunned. 
"I guess you don't. So you better come here before something bad happens here", Kobra bluffed. 
"You... You better not lay a hand on my kingdom or I'm going to wreck you!", Aquaman said. 
"Ooh...scary. Now, come here and let's settle this!", Kobra said, dropping the call. 
Aquaman called on Aqualad and Aquagirl immediately. He called Nightwing and Batgirl and asked their help as well. They met at Downtown Gotham. Nightwing and Batgirl shook hands with Aqualad and Aquagirl. It was their first time going on a mission with each other. 
"So, what's your agenda today, King Aquaman?", Batgirl asked. 
"It's the Kobra. He's issued me a challenge telling me to come forth to his new lair. Of course, I would not go alone", Aquaman answered. 
"That nuisance? We've beaten him like a thousand times already.", Nightwing said. 
"Yeah, but he seems more confident and prepared to take on us this time. So, I gave him a chance", Aquaman said. 
"Is that really it?", Aquagirl asked. 
"Uhm, actually, he bluffed me. He told me the directions of his new lair, and it's near our kingdom. He told me if I don't come, he's gonna launch an attack on Atlantis", Aquaman responded. 
"No way! We must go there quick!", Aqualad said. 
Aquaman and his sidekicks now dived into the seas. Nightwing and Batgirl turned the R-Mobile into R-Plane. Then, upon flying above the sea, they slowly landed on the waters, turning the R-Plane, into a submarine. They followed Aquaman and his sidekicks' trail. A few moments later, they reached Kobra's hideout. It is actually near Atlantis! 1 kilometer distant from it. The Kobra's castle's bridge opened. 
"Wow. Grand entrance", Aquagirl said. 
"Yes, it is.", Kobra said, speaking as he broadcasts himself on a monitor on the first floor's hallway. 
"Greetings, Aquaman. I see you brought some companions. For my first act, I will induct some initiation rites for you, as you become part of the cult", Kobra told them. 
"You're crazy", Aqualad said. 
"Just like I figured. You always have your army with you. However, we're not here to a part of them. We are here to end you and your blind followers", Aquaman told him. 
"Kali Yuga will show you the path to salvation.", Kobra responded. 
"Not today", Aquaman said. 
"We'll see about that. Meet me here at the top of the castle, to bear witness, to Kali Yuga's resurrection, if you'll be able to make it", Kobra said, as he laughed. "Alright. Let's do this", Aqualad said. Now, Kobra dropped the call. 
The heroes now climbed the first staircase. Reaching the second floor, the encountered Kobra's monks. The monks were very skilled. They gave the heroes a hard time. But later, they were able to defeat those. More challenge awaited them as they ascended to the third floor. This time, they met more of Kobra's minions, and they are armed this time with laser cannons. The heroes attacked them while dodging the laser cannon blasts and disarming them. Moments later, the heroes taken all of those out. 
"I'd be so pleased if you were able to make it here at the top", Kobra said, broadcasting himself and showing his face from a monitor screen where the heroes were. 
"We'd be pleased to smack your face as well", Aqualad responded. 
"I like your spirit", Kobra replied. "Let's see if that spirit lasts the moment you meet Kali Yuga and I", Kobra responded, dropping the call once again. 
"Seems he's really up to something tonight", Nightwing said. 
"He sure is", Aquaman said, as they ascended to the next floor. 
This time, there were none of Kobra's henchmen. However, from the walls emerged security cameras, with guns attached to them, which fired at continuously at the heroes. The five evaded the blasts while Nightwing and Batgirl destroy those weapons one by one using their Birdarangs and Batarangs. Aquaman went on one side of the walls, then threw his trident on a straight line, destroying the security guns and cameras. Aquaman then picked up his trident after all the security cameras are destroyed. 
"Kobra really wasn't playing around this time. But one thing's been bothering me all this time. How could he have been able to get his hands on all these tech?", Aquaman wondered. 
"That's one big question we've never been able to find an explanation to. All the bad guys we've faced had all these advanced tech.", Nightwing said. 
"We might now be able to figure them out soon", Aqualad said. 
They now proceeded to the next staircase. However, Kobra turned on the red alarm signal and it rang loudly, as the stairs began crumbling. The heroes yelled while in the air. Good thing Nightwing and Batgirl had quick reflexes able to shoot their grappling hook guns and hit the top of the stairs, holding Aqualad and Aquagirl and Aquaman used his grappling hook on his left hand to cling on the top stair as well. They now ascended to the final stair. They saw a golden door. This must be the top now. Large knights opened the doors for them. 
"Impressive", Kobra said, as he was amazed that the heroes were able to survive all his gimmicks. 
"You!", Aquaman told Kobra as he was about to attack him, but he was hit by the large knights from behind. 
"Cool! A mini-boss battle", Nightwing said. The heroes fought the two large knights first. Later, they were able to take them down. 
"Aquaman and company. You are just in time, for my final act. Witness the resurrection of Kali Yuga!", Kobra told them, as he unraveled what seemed like a statue of the sacred creature. 
"You and your blind religion ends...", Aquaman said, as he was surprised by the new look of the Kali Yuga. 
It has been turned into a cyborg, with a huge revolver on its tail and razor sharp tongue and metal fangs. Nightwing and Batgirl threw several Batarangs and Birdarangs at it, but the serpent was quite durable. The serpent shot its revolver at the heroes, who evaded those. The serpent knocks them off by its tail. Then, it slithered towards Aquaman and constricted him. However, with Aquaman's sheer strength, he was able to break free from it. Some parts of the serpent are still natural, and those are its weak spots. Aqualad and Aquagirl hit the serpents weak spots such as its neck and its whole body. The heroes also dodged its fangs and tongue, which are extremely deadly. But Nightwing thought of an idea, and immediately told Batgirl about it. They are the only one's who hold the serpent's weakness: oxygen bombs and Batarangs. The two told the others to distract Kali Yuga, while they aim for the revolver tail and razor metal tongue of the serpent. Nightwing and Batgirl were soon able to hit those metal spots with their oxygen weapons, causing the revolver on its tail to rust and fall apart after a few moments. The rust on Kali Yuga's tongue poisoned it, then the snake soon collapsed. Kobra now ran out of gimmicks, and was forced to activate his castle's self-destruct button. Then, he swam out to the window nearby. 
"Not so fast!", Aqualad said, as he tried to chase Kobra, but was held down by Aquaman. 
"The castle is crumbling! We don't have enough time to get to the submarine", Nightwing alerted them. 
"This calls for a friend", Aquaman said, as he called on for his sea friends. 
Immediately, a whale came to the crumbling castle. They rode the whale's mouth. Just in time, as the castle exploded, they were able to get to safety. Aquaman now commanded the whale to open its mouth and the heroes went out it. 
"Ugh! Now, I smell like algae", Batgirl said, disgusted. The heroes had a good laugh. 
"What about Kobra? We're not able to stop him for good. What if he comes back and does this stupid act again? Who's stopping", Aqualad asked. 
"We are. Don't worry. His followers are down. Even his god Kali Yuga has been put down. Plus, we can handle him anyways.", Aquaman assured. 
"Since Atlantis is just a kilometer away from here, why don't you Nightwing and batgirl pay a visit?", Aquaman offered. 
"Our pleasure", Batgirl answered, as she and Nightwing agreed. 
Now, they headed to Atlantis. The Atlanteans welcomed the five heroes well. They held a large feast for them. Meanwhile, in Black Manta's lair, at his throne, he slammed his close fists at the sides of his throne. Kobra contacted him but he did not responded. 
"Unbelievable! You idiots never cease to amaze me at your failures!", he told himself, referring to the previous villains he's hired. 
"Don't matter. I have so much more in store!", he said, remembering he has the Deep Six at his command next. 
== Characters ==
=== Heroes: ===
* Arthur Curry/Aquaman
* Garth/Aqualad-Aquaman's sidekick who has hydrokinetic powers(can control water) and water-based magic.
* Tula/Aquagirl-Aquaman's sidekick; has great combat skills and is a telepath.
* Dick Grayson/Nightwing
* Barbara Gordon/Batgirl
==== Others: ====
* Atlanteans
=== Villains: ===
* Kobra-cult leader summoned by Black Manta to take down Aquaman; leader of a cult who worships snake god Kali Yuga.
* Kali Yuga-snake god awakened by Kobra.
* Black Manta
* Deep Six