Gracie

Gracie, along with George, was part of 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 and transported to the year 2286, where they were needed to answer an extraterrestial probe. 

The two whales were soon given a home at the New Cetacean Institute off Australia's Great Barrier Reef. 

Shortly afterward, Gracie gave birth to George's calf, which was named Harpo. (SS TOS (The Hero of My Own Life))

Mirror universe
In the mirror universe, the two whales brought back by the crew of the ISS interacted with alien probe and were transformed into huge armored leviathans who then traversed the tsunami-swept oceans, destroying entire coastal cities. After $𝜇$ found a way into the probe, shutting down its computer, the whales are left vulnerable to phaser fire and are subsequently destroyed by the Enterprise. 

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[[category:humpback whales