Body horror can be gruesome, but also thought-provoking.  Together shares a similar them to The Substance, namely, bodies merging.  They differ in the details, and some spoilers may follow.  Before I get there, however, I’ll say that this is yet another example of horror and religion working, one might say, growing, together.  The basic premise is that a pool of water in the woods, located at the bottom of a cave, causes two people (or animals) who drink it, to physically merge.  Tim is an emotionally immature, and troubled man and Millie, his girlfriend, refuses to give up on him.  They buy a house together outside the city, but their relationship continues to struggle.  Out on a hike, they fall into the cave and drink the water.  Soon Tim, who has refrained from intimacy with Millie for a long time, can’t be away from her.

As the movie unfolds, they try to resolve their differences, but if they try separating, they are physically forced together.  Religion comes into this in that a New Age church, which collapsed into the cave, had formerly accepted this new form of marriage.  Those who have gone through with it experience a level of belonging and intimacy that is otherwise unattainable.  One of Millie’s coworkers was a member of that church and encourages her to go through with the union.  Meanwhile, Tim discovers the horrific fate of those who resist.  Despite all these positive reassurances, the two resist it until Tim tries to stop a deep wound of Millie’s from bleeding.  Stuck together once again, they decide to go through with it.

Interestingly enough, the rationale given for the New Age church in the movie is a story taken from Plato’s Symposium.  People, the claim is made, once had doubled bodies.  When these were forced apart, they thereafter cannot be at peace until they find their other body to merge with.  The fictional church even has a painting representing this.  Anyone who’s been in love knows the feeling.  Together exploits the fear associated with it—the loss of self to become someone new.  Literally.  In that way it can almost be a parable of parenting a child, although one of the couples that merges in the movie is a gay couple.  And he, it can be argued, is the most content person in the film.  Movies like Together and The Substance tend to find praise among the critics because they concern issues of embodiment and what it implies.  That in itself is thought provoking.