You knew there was going to be problems when the only surviving original character was the random bloke who had no idea what was going on for the first few episodes....
I did enjoy the season 2 episode when they thought they got back to their Earth, started settling in, The Prof started acting like an arsehole, screwing everyone over for the glory, then Quinn started noticing tiny differences about the world, like one kid in a yearbook photo suddenly didn't have braces. Remmy and Wade think he is going nuts, then Wade looks out of a window and realizes the Golden Gate Bridge is now blue....
They then discover that the Prof is actually the alternate Professor, who locked up the real one in the basement. The two Arturos fight at the mouth of the wormhole and one jumps in. The one left behind reacting as if he was stranded there...