my summary of star-trek-4

summary STAR TREK 4.
a probe moved toward planet earth and sent powerful signals that stop electricity. it destroyed 2 klingon ships- same as story shown in st1, klingons shoot and it shot back. meanwhile kirk is on planet Vulcan which "had not been destroyed when kirk was younger" [note: at the time of the video no doubt until a later  video showed a later time, a romulin came thru a wormhole and destroy vulacn at an earlier time but at this time the Romulan had not yet traveld. hmm. had no cause to travel yet.] anyway, inside klingon space vehicle continuing from part 3, after rejoining spocks body see addendum. they vote to confess and travel to earth for judgement for violating orders in their rescue mission to bring back spock in st3. they would probably be caught anyway so they might as well be nerds and squares... for the marketing to the video buyers customers who certainly like that personality.
they flew to earth and hear the warning that the oceans are boiling into vapor and no electricity.
spock understands that the probe was aiming at the sea hence uhura adjusts the sound for water density. the sound is whale song and spok knows which family whale. they use the klingon sv to fly at warp speed around sun combining speed with sun gigantic mass curving space time [gravity] to move to "around" the second half of 20 century. as spok said with "this" equipment precision is impossible. [they lacked the copyrighted back-to-future device which does calculate precise dates].
they succeed and use klingon technology to hide the sv. they have a complex mission eventually saving two whales and bringing them to their time. how? that is the story. the whales sing and the probe leaves. the end? ah the judgement. yes kirk is punished. they decide they want him flying so they demote him from admirl to captain which is both cnvenient for the brass and truly punishes kirk with demoting.
ADDENDUM: when the video "Star Trek: Into Darkness,2013" told the story of the romulan that destroyed vulcan in star date 2258 they included "older spock". this is a conflict with part 3,1984. older spock needed vulcan experts to rejoin body in the story of video st3. after the romulan destroyed vulcan in 2258, the old spock "will not have rejoined" with body and would vanish. yet they kept him alive until the end relying on most fans forgetting the details of st3.
wen i saw st3 i did not recall it either. until now summarizing st4.