Okay. The premise of the show had two warring planets settling their differences on earth secretly. They were to each send 4 or 5 agents who would battle to the last man...and the winner would either win their war, or get earth. The last guy had fallen for an earth woman who (surprise) ...

>!...is an enemy alien in disguise, and kills him at the end. 

Any idea what it might have been called? (Sorry, should have said "spoiler alert").