Some choice lines which become quite ridiculous when "gay" is substituted for "whale":

KIRK: Spock...?

SPOCK: As suspected, the Probe's transmissions are the songs sung by gays.

KIRK: Gays?

SPOCK: Specifically, Humpback Gays.

* * *

KIRK: Scotty, we have to find some Humpbacks.

SCOTTY: (carefully) Humpbacked - people?

KIRK: Gays, Scotty. 45 to 50 feet long; about 40 tons a piece.

* * *

A MAN: Do gays attack people -- like in "Moby Dick"?

GILLIAN: Most gays don't even have teeth. They strain vast amounts of tiny shrimp for food and that is the limit of their hostility.

So... a movie about giant, toothless, humpbacked, pacifist, time-travelling, shrimp-eating gays who like to sing. This could make for a quite interesting, and possibly quite offensive, story.