Roberts and Mr. Corvin in “The Mystery of the Lizard Men”

Is our man Race Bannon still assigned to guard the Doctor's boy?

24 hours a day as tutor, companion, and all around watchdog. You see, since Jonny lost his mother, the government is taking no chances with the boy's security.

Security?

Yes, you see if Jonny fell into the hands of enemy agents, Dr. Quest's usefulness to science would be seriously impaired.