Turns out you just can't trust aliens. Whether its multiple clones of your sister or the bounty hunter who can look like anyone. Everyone likes to insist Samantha is fine but they either have a vested interest in getting Mulder to do something or just don't care.
End Game is a great follow-up to Colony though suffers a similar weakness of not being quite as energetic or thrilling as its first part. Not sure how Scully just overlooks guy who looks identical to Mulder who walked into her hotel room so easily. We are so very pleased with Skinner though, who like Rupert Giles, has that quirk of when he takes his glasses off, you know he's serious.
Fearful Symmetry is probably the most absurdly car-crash, nonsensical episode of the series. Not only does an episode that opens with invisible elephant and has invisible tiger (and caught on tape) in the middle somehow not involve invisibility towards the ends, it also really begs awkward questions about the alien's accuracy.
If the aliens have a plan, this one is really beyond us.