Lost in Space Season 3 Episode 6 The Space Destructors

While exploring, Will and Doctor Smith chance across a cave containing a control panel. Smith, unable to leave anything dangerous alone, operates several controls and actives an android creating machine. It begins churning out android copies of Smith bent on galactic conquest. Worse, when trying to stop him Will falls into the machine and emerges changed! And that's when Smith learns something about who was really in charge the entire time...