The previews to this episode promised alot, I was not dissapointed.  In this episode, the USS Voyager developed a new(and highly experimental) slip-stream drive.  But just a few parsecs from Federation space something went wrong.  Voyager was flung from the slip-stream and crashed on a planet, barried beneath ice.  Chakotay and Kim(who blames himself for the incident) were flrying lead in the Delta Flyer(relaying slip-stream data back to Voyager), they rode the slip-stream back to the Federation.  Fifteen years later they found Voyager and attempted to send a warning to Seven of Nine(in the past).  But Captain Geordi Laforge didn't intend to let them succeed.
    I enjoyed this episode, especially the part when they boarded the frozen Voyager.  The writers did a great job with this episode, however it was another one of those where we sit there trying to figure out temporal mechanics.  The message from Harry Kim to Harry Kim was a good idea, it made the episode complete.