The Barge of Dr Morrow. LOL.
That whole last scene confused me as well. At first, I wasn't sure if that was the same girl that grew wings and flew away earlier in the show or someone else. Secondly, that whole adam and eve marketing slogan would only fit IMO if they had already perfected the intended process. Since the process is not perfected (as seen by the rejects on the barge), there was no way they could advertise the idea to other people in an "inviting" enough way to get more test candidates. What do you say to a potential candidate? "Would you like to be the king of the new human race? Well take these injections and this MAY take you there or turn you into a monster???"
I don't think the other monsters were rejects of the serum. I believe DRJ is creating a whole slew of new creatures to repopulate the planet with. That barge was his Noah's Ark - one male and one female of each of the species from his design. I believe his plan is to take all of these creatures to some remote location (probably an island) and then use the amphilicite he's been gathering to destroy the rest of the world killing all of the human race and everything else with it. Once the earth is wiped clean, he can unleash his creatures on it and be the new god (creator) of life on earth. The only thing I'm having trouble wrapping my head around is what exactly he needs Olivia for. He was trying to force her to strengthen her powers a few episodes back, but for what reason, we don't know yet. It could be possible that he's going to take her with him to this island and he and Olivia will play the role of Adam and Eve for the new enhanced human race.