Moat Monster was the Mythical Dragon like Antagonist of the Naruto Series.
The 3 headed legendary beast was built by Penelope for unknown reasons. The Prince of the Genkai went into Monster's Lair only to find Menten the Princess of the Sky was about to be swallowed by the Moat Monster. The Prince of the Genkai fought against it and won and saved Menten and was married.
The Chūnin ExamEdit
Team 7 returned to Konoha to continue with their lives as regular genin. One day, whilst playing with Konohamaru, Udon, and Moegi, Naruto met three genin from Sunagakure, Gaara, Kankurō, and Temari, and learned that they were in Konoha to participate in the Chūnin Selection Exams. Meanwhile, Kakashi, Asuma and Kurenai all volunteered their teams for the exam as well. Naruto was thrilled at the possibility of becoming a chūnin. The first part of the exam (proctored by Ibiki Morino) was written, but it was not a test of knowledge as much as a test of information-gathering and willpower. The first nine questions were supposed to be obtained by cheating, where the genin must use any techniques to find out the correct answer without being caught. Naruto, who did not realise this, went into a traumatic state in which he felt that he would cause his entire team to be eliminated, as he did not know the answer to any of the questions. Sasuke realised that he, too, did not know the answers, but immediately activated his Sharingan to copy someone else's answers. Sakura, as a testament to her incredible intellect, answered all of the questions quickly (a feat which the examiner later said could not be accomplished at genin level). The last question was a do or die question: if one didn't answer, one's entire team failed the Chūnin Exams, but if one answered incorrectly, one would remain a genin forever. Naruto showed that he was not a quitter when he exclaimed that he didn't care if he stayed a genin forever, and that, even if that came to pass, he would still become Hokage. The genin who chose to answer the question all passed the first part of the Chūnin Exams — including Naruto, who didn't answer a single question on the written part of the exam. The second part of the exam (proctored by Anko Mitarashi) was a survival exam in the Forty-Fourth Training Ground, also known as "The Forest of Death". During this part, Naruto found himself in a desperate situation against Orochimaru, an S-rank missing-nin from Konoha so powerful that the Third Hokage later mentioned that there was nobody in Konoha that could fight him equally. It turned out that Orochimaru used to be one of the Third Hokage's pupils, also known as the Sannin. Naruto and Sasuke's reactions to the situation were a complete reversal of what had happened in the Land of Waves mission — Sasuke was frozen with fear while Naruto fought on fearlessly, at one point stopping Orochimaru's huge summoned snake in its tracks on his own (with the help of some demon fox chakra), and muttering to Sasuke, in a moment of glorious retribution that marked another milestone in their rivalry, "You're not hurt, are you… scaredy-cat?" Naruto eventually snapped Sasuke out of his panic. However, Orochimaru used the Five Elements Seal on Naruto, disrupting the flow of the demon fox's chakra, as well as Naruto's own. However, Orochimaru was too much for Sasuke as well. In the end, Orochimaru put a Cursed Seal of Heaven onto Sasuke's neck, saying that Sasuke would eventually come to him for the power he needed to kill his brother, Itachi Uchiha. Orochimaru then left, sending his three genin, Team Dosu from Otogakure, to go after Sasuke. While both Naruto and Sasuke were unconscious from the fight against Orochimaru, Sakura had to take care of them. It was there that Sakura's personality reached a turning point. As Kin Tsuchi of Team Dosu trapped her by roughly holding her by her hair, Sakura realised how pathetic her behaviour was, always blindly prasing and criticising others, when she was the one who hadn't improved at all. She reflected on herself, thinking how she was always telling Naruto that she was better than him, when he had been the one who was consistently improving, and telling Sasuke she loved him when she couldn't even muster up enough strength to protect him as a team-mate, before she symbolically freed herself by cutting off her long hair with a kunai, which she had initially kept long because it had been rumoured that Sasuke liked girls with long hair. She also decided to fight against the Oto genin, and resolved to no longer be dependent on her team-mates. At this point, Team 10 arrived on the scene. Rock Lee fought the Oto ninja and used the Front Lotus on Dosu, who was saved by Zaku but admitted that the Lotus still almost killed him. Dosu Kinuta, the leader of Team Dosu, mentioned that Neji could "see through them", but before Neji could attack, an awakened Sasuke intervened. The cursed seal on Sasuke had by now started to take effect, and, in a state of insanity and murderous intent, Sasuke defeated Zaku Abumi of Team Dosu, going as far as to dislocate his shoulders for no other reason than to cause him pain. Before he could do any more damage to anyone else, however, Sakura hugged Sasuke, crying and begging him to stop, allowing Sasuke to regain control of the Seal. Dosu left with his team-mates, wondering why Orochimaru had sent him to kill Sasuke if he had known that Sasuke would have the cursed seal. Team 7 still managed to make it past the second stage by defeating Team Oboro of Amegakure, with a little help from Kabuto Yakushi, a fellow ninja from Konoha. Seven teams managed to pass, which was more than twice as many as had been expected. To cut down the prevailing genin from the second exam, a preliminary round was staged before the third and final stage of the Chūnin Exams. The twenty-one people — or twenty, after Kabuto withdrew — were to be matched up with each other, in a fight that lasted until somebody gave in or was unable to continue fighting. The proctor of the third exam, Hayate Gekkō, did reserve the right to step in and stop the fight when he felt that there was a clear winner. Sakura at first attempted to tell the examiners that the cursed seal that Orochimaru had placed on Sasuke was seriously debilitating him, but Sasuke stopped her, and told her to mind her own business. At that point, Naruto stepped in to stand up for Sakura, but was swiftly silenced by Sasuke, who acknowledged Naruto by declaring that he was one of the people he wanted to fight. Later on, Naruto would return the sentiment.
The first matchup was Sasuke Uchiha against a member of Kabuto's team, Yoroi Akadō. Before the fight started, Kakashi warned Sasuke that, if his cursed seal got out of control, he would have to intervene and stop the match to control the seal; this barred Sasuke from using any technique, as the seal responded to flows of chakra. The match started with Yoroi stealing Sasuke's chakra with his chakra absorption. The match seemed hopeless for Sasuke, until he heard Naruto's taunts. Next to him was Rock Lee, which gave Sasuke an idea. He used the Lion Combo, a partial copy of Rock Lee's Front Lotus, which had been captured by Sasuke's Sharingan. Yoroi was knocked unconscious, and Sasuke advanced to the next round. After the fight, Kakashi took Sasuke away to seal the cursed seal. Up next were Zaku Abumi and Shino Aburame of Konohagakure's Team 8. Zaku apparently only had one functional arm, but he bet that he could win regardless. Elsewhere, the cursed seal was sealed by Kakashi, but then Orochimaru showed up for Sasuke, asserting that all the genin he currently had at his command were disposable. As Kakashi readied his Lightning Cutter, Shino commanded a multitude of insects to attack Zaku from behind, leaving the one-armed Zaku unable to defend himself with his unidirectional technique. Zaku then revealed he could use both arms, but it was too late. The insects had blocked the tubes in Zaku's arms, bulding up the chakra he was trying to use and making the arms explode, thus ending the fight. Orochimaru left, saying that Sasuke would be his someday. The match with Misumi Tsurugi against Kankurō of Sunagakure's Sand Siblings began. Misumi quickly used Soft Physique Modification to restrain Kankurō and threatened to snap his neck, until it was revealed that the Kankurō Misumi was fighting was just a puppet. The real Kankurō was disguised, controlling the puppet with the Puppet Technique. He used the puppet, Crow, to crush Misumi's bones, defeating him. The fourth match, Sakura versus Ino of Konohagakure's Team 10, was particularly meaningful, as the two were rivals. The match dragged on for a very long time, since they seemed to be quite on par, until Ino tried to possess Sakura's body to force her to forfeit the match; however, Sakura's will expelled Ino from her mind. Exhausted and out of chakra, they both went for a final attack, hitting each other at the exact same time and rendering each other unconscious. Hayate declared that neither of them would move on to the next round. The fifth match was Paul Gekko and Thetis against Temari of Sunagakure's Sand Siblings. The match was over quickly, Paul and Thetis have successfully summoned the revived the Three Headed Shakaku and managed to survive Wind Release techniques and got used by Temari, who was recently scared that the Moat Monster was known as Shakaku of the Dune Seas and lost and got swallowed into it's belly.
The Appearance of the Antagonist was the Three Headed Robotic Dragon with Large Wings.
The Abilities of the Dragon was the Shooting Missiles from it's Mouth and Breathing Fire.