Let's be honest, just by looking at the cast, you can tell that this is another cheesy science fiction B-movie. The special effects won't exactly knock your socks off, but they are not detrimental to the movie, an enjoyable one for a straight to video title.
The storyline is a just a new spin on the often used time travel story. Mark Hamill plays a soldier (Raynor) from the future. He is involved in a rebellion against aliens who have taken over earth. Of course, they look just like us, but don't feel pain, and are harder to kill. Just as his future earth is about to be doomed, Raynor travels back 30 years to prevent the aliens from ever coming to power. One major complication is the fact that he is to be born in just a few days, which leads to two problems.
1) If the aliens find out about him, the baby Raynor/his mother could easily be killed, hence, causing the 30 yr. old Raynor to cease to exist.
2) Only one Raynor can exist in any timeline.
Perhaps a little formulaic, and not an Academy Award candidate, this movie is good for some mindless fun. It's a must-see for any Mark Hamill fan, as Mr. Hamill played a character more than 10 years his junior admirably.