Star Trek: The Next Generation - 4x17 - Night Terrors

    The Enterprise runs into a ship that has been drifting for awhile.  Almost everyone on board is dead, there's just a single Betazoid person alive, but he seems pretty messed up.  Everyone on board the Enterprise starts to start acting weird, hallucinating, and snapping at each other.  And their engines aren't working.  Troi is having nightmares.
    I've seen this episode many times, and it's a lot of fun.  It's one of the creepier episodes of TNG, and that alone makes it worthwhile.  There's a great sequence where Crusher is in the Enterprise's morgue, and starts hallucinating that all the bodies are sitting upright.
    The more I think about the plot of the episode, the more it seems like a stretch.  Troi is getting a dream message from some other species that's stuck in the same trap?  And they give a vague message about how to get out of the trap by using a simile?  They're already speaking English!