George and Gracie

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George and Gracie were a mated pair of humpback whales, born in the Pacific Ocean on Earth in the 20th century. In 1986 they were taken aboard the HMS Bounty and transported to the year 2286, where they were needed to answer an extraterrestial probe. (TOS movie: Star Trek IV: The Voyage Home)

The two whales were soon given a home at the New Cetacean Institute off Australia's Great Barrier Reef. (TOS novel: Probe).

Shortly afterward, Gracie gave birth to a calf, which was named Harpo. (TOS short story: "The Hero of My Own Life")

[edit] Mirror Universe

In the Mirror Universe, the two whales brought back by the crew of the ISS Enterprise interacted with alien probe and were transformed into huge armored leviathans who then traversed the tsunami-swept oceans, destroying entire coastal cities. After Spock finds a way into the probe, shutting down its computer, the whales are left vulnerable to phaser fire and are subsequently destroyed by the Enterprise. (ST roleplay module: Through a Glass, Darkly)

[edit] External Link

George and Gracie article at Memory Alpha, the wiki for canon Star Trek.