I watched it on TV in 2002-2004.
As I remember, five or four astronauts receive a SOS signal from a station or ship and go to investigate, only to be attacked by an alien creature very similar to a Xenomorph. They escape but everyone except the main actor is infected with alien eggs (which are located on the right side of their neck). Slowly the aliens inside them begins taking control of them and ordering them to spread the alien eggs on Earth, except for the main actor's girlfriend who has a "good alien" in her called Sabrina (I think). There was a scene where she is arguing with main actor and he jokingly asks: "Who am I arguing with, you or Sabrina?", "Both" she said.
Later, the astronauts are transformed into aliens by literately ripping their skin and aliens emerge from them, except Sabrina, who sacrifices herself to save the host woman (by leaving the host as a green alien-silhouette).
In the finale, the main actor confronts his old friend who transformed into an alien and kills him with a rocket launcher. The end scene shows some homeless guy wearing the stereo and he is infected with an alien egg on the neck, slowly walking into the night.