The Amazing 3, or Wonder 3 (Japanese: W3（ワンダースリー）, Hepburn: Wandā Surī; read as "Wonder Three"), is a Japanese comic series and a black-and-white Japanese animated television series created by Osamu Tezuka in the 1960s. It involves the adventures of three agents from outer space who are sent to Earth to determine whether the planet, a potential threat to the universe, should be destroyed. Landing on Earth, the characters take the form of a rabbit, a horse, and a duck, and make friends with a young human boy.

The series was first published in print format as manga in Japan in 1965, and then spawned an animated television version, with different stories. The latter was dubbed in English and broadcast in the United States with a different theme song, as well as different closing and opening elements, under the title The Amazing 3. The American version was also aired in Australia in 1969 and in Spanish-speaking countries as Los tres espaciales. The Japanese-language animated version was first released on DVD in 2002, and then a full 10-DVD set in 2005.

The series tackles a number of issues that were unusual in animated cartoons of that period: in particular, ecological concerns and poverty and racial diversity.

In 2017, a Kickstarter campaign for an English translation of the manga from Digital Manga made $82,137. The manga was released in 2020, under the title Wonder 3.

The Galactic Federation is concerned about the number of wars on the Planet Earth. It sends three agents to determine if the planet is a potential threat to the universe, and whether it should be destroyed. The instrument of destruction is a device resembling a large black ball with two antennae that is variously called an anti-proton bomb, a solar bomb, and a neutron bomb. The agents (Captain Bokko, Nokko, and Pukko) are originally humanoid in appearance, but upon arrival on Earth they take on the appearances of a rabbit (Bokko), a horse (Nokko), and a duck (Pukko) that they had captured as examples of Earth life forms. While on Earth they travel in a tire-shaped vehicle capable of enormous speeds called the Big Wheel, which can travel on both land and water (and, with modifications, through the air).

After landing, they are befriended by Shinichi Hoshi, a young boy who becomes their ally throughout the series. The series also features Shinichi's older brother, Kōichi, who is a member of the secret intelligence agency "Phoenix", formed to protect the peace of the world. The Wonder 3 are initially repulsed by the violence of the earthlings, especially Pukko, but gradually change their thinking after being touched by the kind personality of Shinichi.

In the final episode of the series the decision is made by the galactic council that mankind is irredeemable and that the Earth is to be destroyed. Although Pukko is in favor of this as much as ever, Bokko puts off the order as long as possible, and eventually decides to disobey the council's decision. However, prior to Bokko's decision to disobey her orders, Shinichi is appalled at the likelihood that his friends would obey the order and runs to Kōichi to ask Phoenix to intervene.

Although dozens of Phoenix agents fight the Amazing 3 in their saucer, they are unable to destroy it, and Shinichi appeals to Bokko, Nokko, and Pukko to take him back to their home planet to plead Earth's case. During the trip Bokko, Nokko, and Pukko revert to their humanoid forms for the first time, much to the surprise of Shinichi, who had never seen their true appearances before (perhaps not clearly, anyway – he had also seen them through the window of their saucer in the first episode, though it's suggested in the episode that he could only see their silhouettes).