A pair of humpback whales at the Cetacean Institute in 1986, whom Kirk brings to the twenty-third century to answer an alien probe.
George and Gracie are two humpback whales living at the Cetacean Institute in Sausalito, California, in Star Trek IV: The Voyage Home. In the twenty-third century, humpbacks are extinct, and an alien probe is devastating Earth while trying to communicate with them.
Kirk's crew travels back to 1986 in a captured Klingon bird-of-prey and beams George and Gracie aboard, with Gillian Taylor's help. Gracie is pregnant. Back in the future, the whales answer the probe, which leaves Earth.