- Mild
- There are some frighting scenes but not too scary
- Shocking for the time the show wasn't afraid to kill to kill off main characters this became a staple of the star trek series.
- Tense arguments about command and political strive.
- Kirk has anger problems and often smashes things etc this can be frightening due to the realistic nature of these scenes.
- Often times Phasers are set to stun and not kill but sometimes people are killed and it can often be sudden and on screen especially in the final season.
- The OST can be threatening sometimes especially during the infamous "You can't kill me, I'm part of you scene." from season 1.
- The show doesn't deal in good and evil and is morally complex although Kirk is seen as the good guy there is no clear cut good person.
- Some decisions led to massacre and war.
- Characters freeze to death, in one scene a main character does so and it is upsetting, this was especially shocking as it was the episode before the end of season 1 and no one at the time expected it.
- Kirk has mental health issues that decorate over the series.
- The characters' lives are frequently in danger, and some characters DO die.
- Often times parts of the show don't exist they are dream sequences are illusionations, some parts are not real at all and some characters never even existed, this is especially shocking when it is revealed in season 3 that a fan favourite died in season 1 and he was never there, it is even more shocking watching on rewatch and noticing the subtleties.
- Unlike Star Wars, Star Trek has always been a character based show meaning that the primary focus on the series is the character and the universe building as opposed to battles and action, that said the show has become violent at times although not in the least bloody A total of 5 out of the 9 main characters are killed or die, one in a very tragic scene attempts suicide.