Henry88, I'm passing the poll to you if you'd like.
I'm with lhb412 when it comes to this episode. I got into the show before this one aired and really was excited to see them do the movie, obviously. When it came together so perfectly it really was instant nostalgia. So happy it won this poll, because I could really watch this episode once a month or so and never get tired of it.
It helps that GvsMegalon itself is a really nostalgic movie for me. It was one of the earliest ones I got a chance to watch and I watched it very often. Other than Sea Monster, GvsMechaG, and Gigan, I'd say this one is one of my most nostalgic G movies (the Sea Monster episode of MST3K is another great one!!!). I'm willing to forgive it a lot, despite how bad it really is at times. MST3K just completes it.