Immediately after Sasuke defeated Orochimaru, he went into one of Orochimaru's many experimentation labs and freed Suigetsu, who was sealed inside a holding tube. After threatening Sasuke, holding his hand in a style reminiscent of the one used to perform his clan's Water Gun Technique, he pointed out that he owed nothing to Sasuke for dealing with Orochimaru as there were many who wanted to do it and it was just a case where Sasuke was able to, because he was always in close proximity to Orochimaru. Suigetsu nevertheless agreed to join him in the hopes of meeting Kisame Hoshigaki and taking Samehada for himself. Once they left, Suigetsu had Sasuke take him to the Land of Waves to retrieve Zabuza's Kubikiribōchō from his grave. In the anime, the story of Suigetsu obtaining Zabuza's sword was expanded and lengthened out slightly for this episode in order to facilitate an earlier display of his abilities. The sword in question was taken from Zabuza's grave by a politician and crime boss named Tenzen Daikoku, who wanted to take the sword as a trophy, and for "revenge" after losing many men during Zabuza's attempted coup years before.
They then went to the base where Karin resided, where Suigetsu was instructed to free all the prisoners. Before releasing them, however, Suigetsu told them to spread the word that Sasuke killed Orochimaru, and would bring peace to the world. As Sasuke hadn't ordered him to say these things, his motives appear to be unclear.
Suigetsu and Jūgo caught with Sasuke's snakes.
Once Karin was persuaded to join, they headed to meet with Jūgo. They had to fight their way through an army of people branded with the Cursed Seals to reach him, and, under Sasuke's orders, were told not to kill any of them whilst subduing them. When they found Jūgo, who promptly attacked them, Suigetsu attempted to kill him. However, Sasuke intervened, and threatened to kill both of them if they didn't stop fighting. Jūgo eventually calmed down, and, with some persuasion on Sasuke's part, was recruited. Afterwards, Sasuke told them their mission and their new team's name; they would be known as "Hebi", and their mission was to find Itachi Uchiha.
Suigetsu interrogating Ginji.
Soon afterwards the team split up, searching for information about Itachi's whereabouts. This led Suigetsu to a bank where Akatsuki member Kakuzu's banker Ginji was. Recognising him as such, Suigetsu threatened him to talk. Seeing Deidara's large suicide bomb's explosion, Suigetsu was drawn to the site of Sasuke's battle with Deidara, where he had used a special seal to summon Manda and had used the snake to escape the explosion. It had, however, been a little too late, and Manda died, making Suigetsu tell Sasuke that he should treat animals a little better.
Suigetsu clashing with Kisame.
After they had rested and continued on their way, Sasuke found Itachi in an Akatsuki hideout. The clone of Itachi then guided Sasuke to an Uchiha hideout. On their way there, the group encountered Kisame Hoshigaki, who told them Sasuke must go alone. Leaving Hebi behind, Suigetsu challenged Kisame to a battle, who gladly accepted, while Sasuke finally made Itachi's death a reality. It was later revealed that Zetsu interfered in the fight, leaving both Suigetsu and Kisame alive.
Invasion of Pain Arc
Taka confronts Killer B.
Hebi, now renamed "Taka", began working with Akatsuki. They went to Kumogakure and confronted Killer B, the jinchūriki of the Eight-Tails. Suigetsu attacked him first, but was quickly disarmed. Both Jūgo and Sasuke's individual attempts at subduing Killer B failed as well, and Sasuke would have suffered fatal injuries had Suigetsu not intervened to spare him a finishing blow from the jinchūriki. However, Killer B's electric attack overwhelmed Suigetsu, cleaving a substantial tear in his sword, and it would have severed in half had Sasuke not nullified the attack in time.
After Karin healed Sasuke, Suigetsu, together with Jūgo and Sasuke, engaged Killer B once more to no avail. At one point, Suigetsu succeeded in immobilising Killer B providing an opportunity for Sasuke to use a lightning attack. Unfortunately, to keep Killer B held, Suigetsu voluntarily received Sasuke's lightning technique as well, sustaining considerable damage.
Suigetsu fighting Killer B in his Eight-Tails form.
After severely wounding Sasuke, Killer B invokes his tailed beast form in order to deal with the rest of the group. Suigetsu, thrown into the water earlier, emerged, using the body of water, to save his team-mates from what would been a devastating blow. Keeping the Eight-Tails at bay momentarily, Suigetsu valiantly told his weakened team members to escape, though somewhat amused that he was risking his life for them. When Killer B tried to use a Tailed Beast Ball on the team, Suigetsu used himself as a shield, keeping his team-mates safe.
Although Suigetsu was left unconscious, he managed to gain the time Jūgo needed to revive Sasuke. By unleashing Amaterasu on the Eight-Tails, Sasuke was able to turn the tide, at last successfully capturing the Eight-Tails Jinchūriki. After the battle was over, Jūgo carried Suigetsu away. While Taka recuperated, Suigetsu recovered in a tank of water. He yelled at Karin for leaving his sword behind, but was later seen to have recovered it.
Five Kage Summit Arc
Suigetsu clashing with Darui.
Once healed, Taka set out for Konoha. Along the way they were intercepted by Tobi, who informed them of Konoha's destruction and their failure to capture the Eight-Tails. He convinced Sasuke to go to the Kage summit to kill Danzō, so Zetsu led them to the Land of Iron. Upon their arrival Suigetsu scouted the area, in order to find a way to the summit, but he found that there were too many samurai patrolling the area. Jūgo found them an alternate route, where they were attacked by the samurai, having been exposed by Zetsu. As Sasuke killed their attackers, Suigetsu pointed out that he (Sasuke) was doing the very thing he forbid him to do.
The Fourth Raikage soon arrived to fight Sasuke and Suigetsu tried to help, but the Raikage breaks his Kubikiribōchō in half. He used what remained of his blade to fight Darui, and was able to hold his own, until Darui infused his own blade with electricity, allowing him to overpower Suigetsu and pin him to a wall. When Sasuke destroyed the room they were in, Suigetsu was freed. He retrieved his sword and regrouped with Jūgo. They contemplated following Sasuke and the Raikage, but decided that it would be too dangerous. Instead, they dressed up as samurai to gather information while avoiding drawing attention to themselves, at Suigetsu's suggestion. They were quickly detected, and Jūgo stated that it wasn't the best plan.
Shinobi World War Arc.
Suigetsu and Jūgo escape.
As the war was being waged, Suigetsu and Jūgo escape their cell in the Land of Iron, having taken care of the guards, and stating that security had got looser. Suigetsu said he wanted to go looking for his Kubikiribōchō, to which Jūgo agrees to help. He then states that Jūgo is nicer than Karin, and then they decide to look for her as well. During their search for the sword, Jūgo asks why Suigetsu, being a person who gets bored easily, is so particularly obsessed with those swords. Suigetsu then reveals his dream of reforming the Seven Ninja Swordsmen of the Mist and becoming their leader.
Suigetsu and Jūgo escape from the samurai compound. They walk through a forest and discuss their plans. Suigetsu tells Jūgo that even if they reunited with Sasuke and Karin, it wouldn't be a grand reunion of sorts as Karin wanted Sasuke to herself in order to seduce him. As they continue onwards, Suigetsu tells Jūgo that they'd continue to get in Karin's way which was his second favourite thing to do after collecting swords. They proceed to head towards one of Orochimaru's hideouts. On the way there, they learn about the war. After arriving, Jūgo and Suigetsu have a brief conversation before Jūgo loses control and attacks Suigetsu, who is unharmed. Breaking into a wall, Orochimaru's secret room is discovered and within it, Suigetsu finds a scroll — the contents of which shock him somewhat. He takes the scroll stating that it could be beneficial to Sasuke and to possibly gain control of the war.
Suigetsu and Jūgo finds Sasuke.
Later, at Mountains' Graveyard, when Sasuke was being tormented by thoughts concerning what he was, Jūgo and Suigetsu break through the ceiling and enter. Suigetsu examines Kabuto's body while Jūgo examines Anko, the latter stating that she is alive. When Sasuke asks them their purpose of coming there, Suigetsu hands him the scroll — the one with which he exclaims that their group Taka can rule the world with — and making him cognisant of reincarnated Madara's presence even though Itachi forced Kabuto to release Summoning: Impure World Reincarnation, which leaves Sasuke somewhat surprised.