Throughout the seasons there are episodes of gun fights, and fist fights. Travelers who come from the future to enter the bodies as hosts are shown as having a brain hemorrhage prior to being taken over by future people. There are scenes where someone is knocked down by a truck, and other people are killed with a sniper. Average violence.

S1:- There are a few episodes where the F-word is mentioned once, twice at most. Other episodes the F-word is not in use, yet milder profanities are mentioned, albeit infrequently. There are infrequent religious slurs throughout S1 on average a few times per episode 26 uses of the f-word in season one

S2:- There are 33 F words throughout this season, on average of 2 per episode. Some episodes have no F-bombs, others mainly two or three F-words at most. Other milder profanities are mentioned but infrequently.

S3:- There is more profanities in each episode of S3 than the previous two seasons. Between 3-5 F-words in an episode. Infrequent religious slurs in various episodes. Milder profanities mentioned sporadically 50 uses of the f-word

S1- There is a heroin addict who is one of the protagonists. He straps his arm up and injects heroin into his vains using needles. One or two scenes show him cooking heroin using a spoon. He is put on medication (pills) to take the addiction down a level.

S1: Alcohol is shown infrequently. A man who is drunk comes home and assaults his wife.

S2: Alcohol and Drug usage is shown throughout. Memory erasing drugs are used. Season 2 is not as bad as S1, it is milder.

Throughout the episodes and seasons, children are used to relay messages from the future to present day people. It would seem they are possessed when delivering the messages, but they are being used as messengers. May seem frightening for some viewers.