Two men kiss a couple of times.

We see a woman in her bar for a few seconds as well as fleeting glimpses of female nudity in some episodes, not graphic.

Scenes with Bart usually end up with her killing someone. But throughout the show she's only ever killed villains or people who really deserve it.

The opening scene is a camera panning around a room full of blood stains, severed body parts and dead bodies. One of the bodies is cut in half.

A dog is killed offscreen

Graphic sci-fi violence, people being shot, stabbed, chopped in half all with blood spray, occasionally it can be very bloody.

Two uses of fuck in the whole show

Large amounts of religious exclamations (Jesus, Jesus Christ, God, Ow My God, etc.) throughout the entire series.

frequent Mild language

Frequent scenes with favorable characters in peril. Some scenes show people in intense pain, these are usually brief. Strong science fiction violence. Younger viewers might be frightened by views of corpses that are burnt or disfigured, or by supernatural events and general spookiness.

The tone of the show can shift from humorous, fun and goofy to horrific, bloody and disturbing in an instant. Might shock some viewers.