Resolved to return to Earth to face the consequences of their actions, the crew of the U.S.S. Enterprise learn of a mysterious alien probe sending out destructive signals at Earth causing critical damage to the planet. Upon investigation, Mr. Spock learns that the probe's signals can only be answered by humpback whales; a species extinct in the 23rd century. With no choice, the crew travels back in time to 1986 San Francisco; a place where none of them have ever gone before.

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