In one sequence numerous "Klingons" are shown to be shot to death, with much purple blood spilled.

A somewhat graphic scene of emergency surgery follows, including the death of the patient.

Two dead crewmen are found in a corridor with small burns on their foreheads.

Another assassin, shot by the character "Captain Scott," falls out of a window, and lands hard, spreading a pool of blood.

There are numerous pit fights at the "Rura Penthe" penal colony two characters are condemned to, leading one character to kick one of the assaulting aliens in the shin, to later be informed that the shins were where that particular species keeps its genitalia.

Kirk and a shapeshifting alien engage in a fight.

Numerous people are seen to be killed due to space combat. An entire ship is destroyed, with the implication that none aboard survived.

In another scene, two main characters are offered cigarettes, one smokes it.

Many people drink an illegal alcoholic beverage during a formal dinner.

An alien smokes a cigar.

Many characters get hangovers from the fictional beverage "Romulan Ale," established as a potent (and illegal) beverage.

A moon explodes and creates a massive shockwave. A Starfleet vessel is hit by it and is severely buffeted by it, violently throwing the crew about as they struggle to ride out the disturbance.

A character with telepathic abilities forcibly interrogates another person's mind -- we hear a loud heartbeat and the person cries out in pain. These scenes may frighten small children.

A few scary dog-like creatures.

The assassination of many people in a scene is quite intense.

A spaceship is hunted by another, invisible, spaceship.