Good you're still with me. I was prepared to drift into a coma at this point. Not I blame him. The Earth of 3000 A.D. pretty much sucks. Terl seems consigned to forever be Earth's Chief of Security.
Contact causes their atmosphere to spontaneously combust.
Deadly gas these people are breathing. Oh, how ever so smart is he. Yes, it's a sad, sad thing to say, but Johnny is the most dangerous human on Earth. While being transferred to his cage, Johnny managed to get ahold of a gun and shoot one of his Psychlo captors. That'll learn 'em to get smart.