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George and Gracie, features at the Cetacean Institute

George and Gracie were a pair of humpback whales who wandered into San Francisco Bay as calves, and were brought to the Cetacean Institute in Sausalito.

By 1986, they had become fully grown, each weighing 45,000 pounds. However, that year it was decided that they had to be released back into the wild because the Institute no longer had the money to feed them their two-ton requirement of shrimp per day.

In the 23rd century, the powerful signal from a deep space probe had caused disruption of Earth's weather patterns, threatening the entire planet. Spock theorized that an alien species had sent the probe to Earth to determine why they had lost contact with humpback whales (which had become extinct in the 21st century).

George and Gracie came to the attention and interest of Admiral Kirk, who had time traveled to 1986 in search for some of these whales.

Upon visiting the Institute, Kirk and Spock determined that they were ideal specimens for their mission. Spock mind melded with the whales to communicate their intentions of taking them back to the 23rd century, wanting to avoid making the same kind of arrogant assumption that those who had hunted the whales to extinction originally had made. In doing so, he learned that the whales were unhappy with the way their species had been treated by man, although they were apparently willing to help the time-travellers. He also learned that Gracie was pregnant. Dr. Gillian Taylor noticed his melding after a visitor pointed him out, and Taylor was initially angry with Spock, but eventually believed Kirk's explanation.

George and Gracie aboard the "HMS Bounty"

The following day, the whales were flown in a special 747 to the Bering Sea, off Alaska, where they were released. The radio frequency of their tracking tags was 401 megahertz.

With Taylor's assistance, Kirk and his crew managed to locate the whales after they were released; although they were targeted by whalers, the crew frightened them off, and then was able to beam the whales into a specially designed tank aboard a Klingon vessel which the crew had commandeered.

After returning with Kirk to the 23rd century, George and Gracie were released into San Francisco Bay, amid the chaotic weather caused by the Whale Probe. George communicated with the probe via the sounds made by the male of his species and the probe replied. Following a brief conversation, the probe ceased its disruptive signal and turned away from Earth, heading out into space. The pair of whales were last seen heading to open water. (Star Trek IV: The Voyage Home)

In the first draft script of Star Trek IV: The Voyage Home (which was then called Star Trek IV: The Adventure Continued), the pair of humpback whales were called "Adam and Evie". Ultimately, they were named after mid-20th century American comedy-duo George Burns and Gracie Allen.
The full-sized whales seen on the surface of water were supervised by Michael Lanteri, intercut with a couple shots of real humpbacks in the ocean near Maui that were filmed by John Ferrari. The underwater versions of George and Gracie were models created by ILM under project supervisor Walt Conti and marine mammal expert Pieter Folkens. (Star Trek Encyclopedia (4th ed., vol. 1, p. 302))
According to the short story The Hero of My Life, Gracie's calf was a male named Harpo. In the FASA RPG module The Hottest Blood of All, published in Stardate Vol 3 #1, the calf is a female named Jessie.

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