So the portion of the ship containing Jack and his commanding partner drifts into the giant object in space (known as the Tet). The five crew members are completely unaware of all this because for some reason they are in a sort of hibernation state. Jack succeeds and the portion containing the five crew members floats freely into space while Jack and his commanding partner board the massive craft. Realizing this, Jack makes a last-ditch effort to disengage a portion of the ship that contains five of the seven crew members. As Jack and his crew get closer, the gravity of the massive craft is so strong that it pulls them in and they cannot escape from it.
Jack Harper (Tom Cruise) and a crew of six others embark on a mission to explore some massive craft in space that orbits earth. I think the best starting place for this movie is a scene that took place near the end.
My Cloud Atlas Explained post and my Life of Pi Explained post are both number one on Google (respectively), so I’m going to try my best to explain the movie Oblivion.