Star Trek The Voyage Home
A mysteriously alien probe visits Earth and spots some hump back whales, after thinking that something is wrong in the time space continuum it starts to attacks Earth's Oceans, Kirk & co use a captured Klingon vessel and trick the Whales into swimming into it. They then travel back in time, and place the whales & a marine biologist (who also slipped though the hole in time & space) back in the right time zone, Spock then tells them that whislt they just arnt welcome in the future.
They fly back to there present where the alien intelligence stops attacking Earth, and leaves. Meanwhile Kirk & co go to Vulcan where they say good bye to Spock, as he starts to test his failing memory
That sounds like a pretty awesome movie still.