When Harmonic Convergence drew near, Oogi flew the family back to Republic City and subsequently joined them to travel to the Southern Water Tribe by ship. When the flying bison tried to bring Bumi, Kya, Tenzin, and Korra close enough to the South Pole, they were attacked by a multitude of dark spirits. Although his passengers tried to defend him, they could not prevent dark spirits from latching on to him, weighing him down. Unable to stay aloft, Oogi crash landed, throwing his passengers. He later flew back to the Southern Water Tribe compound with Asami Sato, Tonraq, Naga, and Pabu, leaving his master and his friends to venture into the Spirit World.
Following Harmonic Convergence, Oogi joined Team Avatar in their quest to gather new airbenders to revive the Air Nation. As the group departed Republic City on their Future Industries airship, Oogi stood with Naga on the upper deck to let their tongues hang in the air.
Oogi later participated with Team Avatar's rescue of airbenders from Ba Sing Se, soaring by the Earth Queen's Temple to catch Korra and Tenzin before doubling back to rescue Mako, Bolin, Jinora and Kai.
At the Northern Air Temple, Tenzin used Oogi as a demonstration for what one could accomplish upon mastery of the control of a sky bison. Later, after Jinora and several calves were captured by bison rustlers, Oogi, at his master's direction, rammed into Ganbat's getaway truck while Kai was lifted onto his back. He later landed to corner the leader.
Oogi carried Korra, Tenzin, Jinora, Ikki, Meelo, Kai, and Ryu into the Spirit World, where they hoped to be able to reason with the spirits. Discovering the flower field the spirit portal led to destroyed, Oogi touched down and let everyone off his back. Their visit was cut short, however, as the vines of the scorched spirit flowers started to attack. After Meelo rode up his tail using the air scooter technique, Oogi took to the sky and flew out of the Spirit World.