The Alien Nation
Alien Nation is a routine cop thriller with a comedic sci-fi twist. They get drunk on sour milk. They have two hearts and bald, spotted heads. They're highly intelligent, but if you drop them in seawater they'll melt into a puddle of goop. They're "Newcomers", and they arrived as refugees in a massive alien slave-ship, quarantined for three years and then reluctantly accepted as citizens of Earth.
Alien Nation - The Complete Series