S1 E1 Young woman assumes to be naked but under sheet covering her partially.

Very frequent gun violence, both with realistic weapons - though those are brandished more than fired - and with scifi weapons that nonetheless cause at least momentary trauma, unconsciousness, etc.

Hand-to-hand combat, some shootings. People die violently in many episodes by both mundane and supernatural means. Scenes with blood are usually short. Some deaths are disturbing, for example, by desiccation (drying out like a mummy).

Some of the artifacts cause creepy things to happen, which might frighten people. There is an episode where people get sick and become mindless zombie-like things.

The show, in general, is quite tame, not very violent, and not too intense except when characters are in danger of being permanently trapped somewhere. There is frequently a race against time to prevent horrible things from happening. In one instance the Earth was a few seconds away from being destroyed.