For All Mankind Season 3 Episode 4: Ending ExplainedThe newsreel remarks that the rescue operation would be the first time since the Apollo-Soyuz docking mission of 1988 that cosmonauts would set foot on an American spacecraft once the rescue is successful. Meanwhile, Dani carefully manoeuvres the Soujourner beside Mars-94, keeping a healthy distance beside them, and instructs her co-pilot to get a video of their LH2 valves to send to Houston, as the Russians use liquid hydrogen for fuel, which could come in handy for Soujourner to rejoin the race if they can access that from the Russians. As the Russians start climbing towards the Soujourner via tethers connected to Mars-94, one astronaut starts capturing video of the LH2 valves and sending them to Houston. As the downlink of video footage continues, Aleida realises that the heat from the nuclear engine could affect the liquid hydrogen, which would result in both the ships being taken out. Aleida instructs the communication team to warn Sojourner to cease all rescue operations and distance themselves from the Russian spaceship immediately. However, there is still a five-minute transmission delay. The warnings are thus effectively useless, leaving the crew of the Soujourner on their own. As the last cosmonaut makes its way to Soujourner, one of the LH2 valves bursts, leaking and causing the M-94 ship to topple over. The movement effectively crushes the astronaut who had been taking the video of the valves, kills the cosmonaut who had been hanging on the tether and moving towards Soujourner, while the astronaut coordinating the rescue sees the now loose tether moving towards him and cracking his helmet before the screen cuts to black.
With guidance from Avatar Roku and Fire Lord Sozin's final testaments, Aang and Zuko respectively both learn about the Roku and Sozin's childhood friendship. Sozin suggested to Roku that the Fire Nation should conquer the world to ensure universal prosperity. As the Avatar, Roku knew the importance of balance between all peoples and vehemently disagreed. Twenty-five years later, Roku's volcanic island home erupted, prompting Sozin to travel 100 miles to help his old friend. At the last moment, with Roku suffocating from volcanic gases, Sozin realized that he could set his plans in motion if he let Roku die and abandoned him. Roku perished and was reincarnated as Aang. Sozin knew that the next Avatar would be an Air Nomad, leading to the destruction of the Air Temples, but understood that Aang had eluded him. Confronting Iroh in his prison cell, Zuko learns that Avatar Roku was his mother's grandfather. Iroh states that this symbolizes the battle within Zuko himself to restore balance to the world. Aang meanwhile discusses with his friends that Roku and Sozin's story shows that everyone is capable of both good and evil, and that Ozai and the Fire Nation must be treated humanely.
Sokka reunites with his father and begins brainstorming a new escape plan: They decide to take the warden hostage during a prison riot and escape on the gondola to the other side of the lake. Chit Sang is interrogated and reveales that a disguised guard helped his attempted escape, but claims it is a guard who had previously placed him in the cooler to save Sokka, and rejoins the group after starting the riot. Mai arrives and confronts Zuko about breaking up with her through a letter, calling him a traitor to the Fire Nation. When the commotion of the riot breaks out, Zuko traps Mai in a cell and leaves to help his friends. Suki kidnaps and ties up the warden, and the group successfully board the gondola, but are pursued by Azula and Ty Lee. The warden breaks free and orders his guards to cut the gondola's cable line. Azula and Ty Lee escape to watch the group's demise, but Mai intervenes at the last second to subdue the guards and allow their escape. Mai calmly tells Azula that she loves Zuko more than she fears her. Enraged, Azula moves to strike Mai, but is chi-blocked by Ty Lee. Azula furiously orders both of them to be thrown in prison. Sokka and Zuko return to the Western Air Temple with Hakoda, Suki, and Chit Sang by stealing Azula's airship, reuniting Katara and Hakoda once again. 781b155fdc