"Because you are one of them--the leader. I should have known
it before, I guess. It wasn't until I saw the hardened crystal
that I knew. That's how you got to earth, Doctor--as a pair of
innocent-looking crystals. I don't pretend to understand what kind of
creature you are but I've seen the other crystal there in both its
frozen and its active states. I imagine you were the first one to be
activated. The real Dr. Temple received the crystals for research. He
was probably the first one to touch them with his bare hands--or his
tongue."
"You have a vivid imagination, Mr. Cameron."
"Then all you had to do was find a suitable subject for the other
crystal. Helen Darrow was a shrewd choice. She would never be suspected
and she could work closely with you under the guise of a student."
"Helen Darrow?"