Psychologist Kris Kelvin (Donatas Banionis) spends his last day on Earth reflecting on his life while walking by a lake near his childhood home, where his elderly father still resides. Kelvin is about to embark on an interstellar journey to a space station orbiting the remote oceanic planet Solaris. After decades of study, the scientific mission at the space station has not progressed, with the crew sending confusing messages that appear to be gibberish. Kelvin is sent to evaluate the ship as it orbits the planet and determine whether the venture should continue. Read more on Wikipedia.