Just started watching this show again, since I haven't ever seen it subtitled. This second episode is well named, dealing with an invasion from space by plant-like aliens. I saw it under the dubbed version called "Shrubs from Space" and I don't actually remember that much about it.
This is really the only way as the Hawai'ian dub is sub par and the second US dub is mainly played for laughs. Here the terror is pretty intense, since the aliens drink human blood and turn them into plant monsters themselves.
I'm looking forward to the rest of the series now.