Matt and George ending their partnership after a fight over George's promotion, Matt and Cathy finally getting together, only to break up a few scenes later, Buck becoming friends with his teacher (or even more?), not to forget the entire Tenctonese species is about to be wiped off the planet by the evil purists who are going to flood the air with a deadly bacteria.
original airdate--May 7,1990
"That was the scene in California's Mojave Desert five years ago--our historic first view of the Newcomers' ship. Theirs was a slave ship, carrying a quarter million beings, bred to adapt and labor in any environment. But they'd washed ashore on Earth, with no way to get back to where they came from. And in the last five years, the Newcomers have become the latest addition to the population of Los Angeles."