Jake the Dog

Four years later, when the  Digimon Emperor  began his conquest of the DigiWorld, Agumon summoned Tai to help. Arriving in the DigiWorld, Tai learned that the Digimon had been rendered unable to Digivolve by the power of the Emperor's Dark  Digivice. Taking cover, Agumon, Tai,  Patamon  and  Gatomon  discovered the Digi-Egg of Courage, which released three new Digivices when Tai touched it. The Digivices were sent into the real world, to be received by  Davis ,  Yolei  and Cody  - the new DigiDestined. When the new kids discovered that the Emperor's  Control Spires  were suppressing Digivolving, Agumon destroyed several as  Greymon, along with the other Champion Digimon. Agumon and each of the other Digimon were given an area of the DigiWorld to guard. However, the Digimon Emperor had plans for Agumon, and captured him, while he was Greymon, with one of his  Dark Rings. The Emperor attempted to make Greymon Digivolve to battle the DigiDestined, but he wound up becoming SkullGreymon once again. When he reverted back to Agumon, the Emperor captured him, and created the  Dark Spiral, a more powerful version of the Dark Ring, planning to use it on Agumon. However,  Wormmon, the Emperor's partner, wanted him to use him to fight, rather than Agumon, and set Agumon free. The Emperor simply tracked him down again, and succeeded in capturing him with the Spiral. Agumon then  Dark Digivolved  into a viral version of MetalGreymon (his power to become Ultimate temporarily restored by the Spiral), and battled the DigiDestined, until  Raidramon  was able to destroy the Spiral and free him. Agumon appeared again to help cause a distraction to allow the DigiDestined to access the Emperor's base, by igniting a stream of oil, with help from Gabumon and Tentomon. Some time later, when  Arukenimon  and  Mummymon  created  BlackWarGreymon, Agumon attempted to talk with the embittered Digimon, to convince him that he did have a heart, and that he would be his friend. The conversation was ended when BlackWarGreymon was caused pain by  Knightmon  breaking one of the seals on the first  Destiny Stone, and BlackWarGreymon left to seek out the pain's source. Later on, Agumon and all the other Digimon of the original eight kids were brought back into the real world to celebrate Christmas with their human partners - only the festivities were cut short when Control Spires started to appear all across the world, and wild Digimon made it through to Earth as Arukenimon opened all the  Digi-Ports. Gennai  gave the original eight Digimon a power boost from Azulongmon 's Digi-Core, restoring their ability to Digivolve to Ultimate, and Agumon went with Tai,  T.K. and Patamon to Paris, where they met up with T.K.'s Grandfather. Discovering that a French DigiDestined girl,  Catherine, was being held prisoner by  Mamemon ,  BigMamemon ,  MetalMamemon  and  Giromon , Agumon and Patamon - somewhat enamoured by Catherine's  Floramon  - became MetalGreymon and  MagnaAngemon  to send them back to the DigiWorld and destroy the Control Spire. Returning to Odaiba to meet up with the other DigiDestined, they discovered that  Daemon  and his minions had arrived on Earth, in search of  Ken  and the  Dark Spore  within him. The Ultimate Digimon battled  SkullSatamon, but were bested by him. In order to give  Imperialdramon  the power he needed, the eight Digimon once again sacrificed their ability to Digivolve to Ultimate, boosting Imperialdramon's power and enabling him to  Mode Change  into his Fighter Mode to destroy SkullSatamon. They returned to the DigiWorld. Agumon came back to Earth once more with the news that BlackWarGreymon was back, and he was searching for  Oikawa, the mysterious man who had already copied Ken's Dark Spore, and who was the creator of Arukenimon and Mummymon. BlackWarGreymon tracked Oikawa down, but Tai,  Kari, Agumon and Gatomon showed up, and Agumon, receiving another power boost from Azulongmon, was able to Warp-Digivolve to WarGreymon once again to battle BlackWarGreymon. With help from Imperialdramon, he defeated him, and reverted to Agumon, to try and talk sense into BlackWarGreymon along with Wormmon and  Veemon. BlackWarGreymon departed to think on what they had said, but was later critically injured in battle with Oikawa, who had become empowered by the forces of darkness. BlackWarGreymon sacrificed what remained of his life, sealing up the portal to the DigiWorld at  Highton View Terrace, as WarGreymon called out his name as he vanished. Agumon appeared again with all the other Digimon, and all the other Digimon of the world's DigiDestined, to witness the destruction of  MaloMyotismon.