Board Thread:General Discussion/@comment-6141704-20161031023246/@comment-30226785-20161205205628

Overflow and Water Hazard are indeed the same alien, I'm not too sure which episode it was, but I'm fairly certain WH had improved movement underwater, y'know, being an aquatic organism, you even see the OrIshan guy casually walk out of the water, he had obviously been underneath the surface for however long.