Conner tells Peter and Anton that Russian authorities were monitoring the gas plant and pulled him out and he spent the next three years in a prison camp. Everyone believes this despite the fact that Conner is heavier and healthier looking then when he died. Peter runs some tests and finds out that the Lindsay clone is pregnant but needs Lindsay's bone marrow to survive. Seems he's the father. He decides that Lindsay clone had to die so Peter melts him with some gas.
Lindsay clone dies too.
Again, the only season worth watching is the first for the few good episodes I mentioned. Lindsay is an annoying cow who always looked as if she were going to wet her pants when the smallest thing happened. She also followed Conner around like a lovesick puppy despite the very obviously fact that Conner was gay. We never found where Elsinger went. I think Anton figured out that Elsinger set Conner up to be killed, returned the favour, hid the body and took his place.