Contagion
Just rewatched "Contagion" for the first time in years, and the first thing I thought of when I saw the portals was that this episode was no more than a rehash of "All Our Yesterdays" from TOS. Atavachron, anyone?

Okona funny lines
As terrible as the episode is, there are some funny lines, but they're all funny by being unfunny. My favorite: "Take my Worf, please."