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 joins 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 the leader's getaway truck while Kai was lifted onto his back. He was later landed so as to corner the leader.