This template contains the plot outline for the last three acts of The Beast with a Billion Backs, which is the same as the plot of "5ACV08" (5ACV08). The content of this page is included on both of those articles to avoid the need to change the same content in two locations.
Everyone turns on Yivo for shklis perverted morals; Yivo admits that mating was shklis original intention, but explains the thrill of perversion wore off and shkle truly fell in love with everyone. Amy points out that Kif was killed when trying to kill shkler. Yivo redeems shklimself by absorbing Kif's remains and bringing him back to life. Kif reunites with Amy, but he is dismayed to discover that Zapp talked her into sleeping with him. Yivo asks to start over with their relationship and pulls shkler tentacles out of everyone. Shkle then asks everyone in the universe out on a date all at once, and after discussing it in an overly-serious council, they accept.
Meanwhile, Calculon and Bender commence their duel with planetary annihilators, but Bender breaks the rules of the duel and fires early, dismembering Calculon's arm and blasting a giant hole in several buildings, including the League of Robots' headquarters. Calculon is outraged, but instead of banning the indifferent Bender from the club as initially implied, he resigns from the League of Robots and names Bender its new president, leaving him with a very warm autograph.
Although the date goes very well, everyone feels that Yivo hasn't made any commitment. In another council, they agree to break up with shklim. As they prepare to go through the Anomaly, Bender wants to come as well, but he is unable to. Feeling offended, Bender goes to Robot Hell where he trades his firstborn son (with whom he reunites, as it's been years since either of them have seen each other) for all the other robots there so he can assemble an army of robots large enough to overthrow humanity.
Everyone else enters the Anomaly via a small wooden box to break the news to Yivo, but shkle proposes to them before they can do so. Everyone is so touched that they are unable to refuse the offer. Bender initiates his plan to take over the world, but Fry announces that because they are getting married, they will be moving onto Yivo's body, since shkle is unable to breathe beyond schler own universe. Everyone in this universe ascends to the Anomaly on a series of golden escalators. Stricken by the irony that humanity has already left without trouble, Bender now truly feels alone.
Yivo makes everyone promise to never make contact with any other universes for as long as they are together. Leela still believes that Yivo is using them for some erotic purpose, especially when she sees that shklis body looks exactly like Heaven. Shkle explains that shkle once transmitted an image of shkler body to artists on Earth: the clouds are gases that shkle emits, and that shkle is covered with birds that look exactly like angels which keep shklis body free of parasites. One evening, Fry writes a letter to Bender back on Earth, now ruled by the robots, depicting his experiences on Yivo—this ultimately breaks his promise to Yivo. When Bender receives the letter, which is made of electromatter, he decides to bring humanity back to Earth.
Leela does see that everyone is living like it really is Heaven, but she still feels that it is too beneficial to be true. But it doesn't take long before she begins to succumb to her own loneliness, and she finally accepts Yivo for what shkle is doing for everyone. As soon as everyone in the universe is happy, giant harpoons begin emerging from beyond the Anomaly and pierce Yivo in the back, causing shklim great pain. Bender's robot army, led by Bender himself, drags Yivo into their own universe where they attack shklim.
Fry convinces Bender to spare Yivo because they are all so happy together. However, Yivo examines the robots' weapons and sees that they are lined with the electromatter from Fry's letter. Realizing that Fry has broken his promise, Yivo's heart is also broken and places everyone on the robots' vessel. Shkle prepares to leave for shklis own universe with great haste for the sake of shklis survival, but finds shklimself unable to take Fry with shklim for what he had done. Instead, shkle takes Colleen, whom shkle feels understands shklis emotions and has inspired her to become even more broad-minded and fall in love with all shkler tentacles. Yivo convinces Fry to return home and move on with his life before returning to shklis own universe with Colleen through the Anomaly, which shkle closes forever.
Fry takes Yivo's advice and begins looking for love. Leela rejects him as usual, though this time apparently for Fry's relationship with Colleen. Amy cannot take him as, as testy as her relationship with Kif is now, she is still his Fonfon Ru, though this is uncertain as "Fonfon Ru" literally translates to "one who doesn't sleep with my superior officer"; Kif also finally gives Zapp a very well-deserved punch in the gut when he rubs it in. Farnsworth and Wernstrom also go back to being archrivals. Soon everyone gets into a big argument that is broken up by Bender. They complain how they were all so happy and in love before Bender's previous intervention, but Bender claims that what they experienced was not love, as love doesn't share itself with the world—in his own words, "There is no great love without great jealousy!" The episode ends with Bender giving Fry and Leela a big hug around the neck (choking them both), telling them both how much he loves them.