Antagonist

Character Role Analysis

Solaris

Again, Solaris isn't much of a bad guy. It doesn't hatch evil plots or wear face paint like the Joker, or breathe evilly like Darth Vader, or build a mechanical Kryptonite duck like Lex Luthor (or whatever terribleness it is that Lex Luthor does)—nope, all Solaris does is sit there and make splooshing sounds. Sometimes it pulls dreams out of Kelvin's head, which freaks him out.

Depending on how you look at it, you could argue instead that Snow and Sartorius are the antagonists, since toward the end they work to get rid of Rheya and the visitors, which Kelvin doesn't want to do. Though he sort of helps them. And you could also say that Kelvin is his own antagonist, using his grief to bash himself. The truth, though, is it's hard to pick an antagonist when the protagonist is so anticlimactic.