I guess a lot of people haven't seen the old SeaQuest series. "The human fish" wouldn't mean that Dean would look like a fish. Dean would just look like Dean except for the gills on his rear ribcage.
He still look like the gorgeious self that he is. Except on this series, he would have to wear more tank tops or be shirtless for most of the season.
Dean guest-starring on Enterprise? As long as he doesn't try hooking up with T'Pol, it'd suit me just fine.
And I'm sorry, I so wouldn't want to see Dean on Boo..er, Babewatch. He might like it too much, but I wouldn't want to see the show. Why in the world did you pick 2 Hasslehoff shows, anyway?