| Director | David Silverman, David Silverman, Raymond S. Persi |
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Siblings Op and Ed, who are Flummels, a species of fluffy rabbit-like creatures with holes in their centers are native to the Galápagos Islands. The flummels are ostracized by their community, due to Op's proneness to disaster, and are labelled weird. Just before Charles Darwin discovers their island during one of his voyages, Op and Ed find and fall into a large flower that teleports them to modern-day Shanghai, where they meet and befriend a white poodle named Clarance. The flummels learn their species is now extinct after Darwin found the island destroyed by a volcanic eruption.
Clarance brings them to the Time Terminal, a pavilion where Clarance's owner, Dr. Lee Chung, kept and studied the flowers and their seeds, which have time-traveling properties. Op accidentally knocks some seeds out, causing the Terminal to malfunction and sending Clarance to 1915 Antarctica, along with the seed that leads the flummels home. In Antarctica, Clarance is captured by Ernest Shackleton's expedition team. With the help of the Extinctables — a team of extinct animals composed of Dottie, a dodo bird; Burnie, a Tasmanian thylacine; Alma, a female Macrauchenia; and Hoss, a male Triceratops, who were brought by Dr. Chung to the Terminal — Op and Ed travel through each seed in order to find the one that can bring them home and rescue Clarance.
Following a falling out with Ed, Op returns to the flummels' time, where she attempts to warn the rest of the flummels about the volcano. Clarance imprisons her, telling her that flummels ruined his life and that he is actually behind their extinction. Clarance had been adopted by Dr. Chung, but after Dr. Chung was charmed by the adorable flummels, Clarance went maverick, pushing Dr. Chung into one of the flowers and destroying the seed that would send him back. He then caused the flummels' extinction by planting a drone bomb. Following Ed's arrival after seeing the video Op made, they make several attempts to escape and stop the bomb, eventually deploying a seed to move the entire island into the present day. Clarance survives, but Dr. Chung arrives and punishes him by sending him back to 1915 Antarctica, thanking the flummels and the Extinctables.
A year later, Op and Ed are finally accepted by their community, while Dottie surprises Ed by laying a blueish egg shaped like a flummel. The egg hatches, but the creature inside the egg is unknown.
In a mid-credits scene, Op surprises Ed by pulling Wally into the Time Terminal. Wally exclaims that they have so much to talk about, while Op leaves to "get him a glass of water".