Common Sense Note
Parents need to know that Star Trek III includes plenty of violence, with hand-to-hand combat (and a knifing), in addition to the usual bloodless phaser fire. There's quite a sense of sadness and loss, too, and a certain heroic starship is destroyed. Kirk and the rest of Spock's friends disobey direct Starfleet orders -- a real first, in a very military discipline-oriented series -- in order to carry out their personal rescue mission.
Phaser and photon starship battles, hand-to-hand combat with casualties, and characters evaporated by death rays. Planets and spaceships blow up.
"Bastard" is uttered in the famous line, "You Klingon bastard, you killed my son!"
There is a continuing theme throughout about how to react with courage and resourcefulness in a seemingly hopeless situation. Themes of loyalty, sacrifice, friendship, and love run throughout.
Star Trek itself is an enormous commodity.
Drugs / Tobacco /
Social drinking, toasts, and a 23rd-century bar.