The term Fifth Column is a name for any organized group that works to destroy an army or nation from the inside.
Cdr. Napier: I understand you people are hungry, but what are you hungry for? Food? Or freedom? It's 400 kilometers to Chicago. Those tanks can make that in 2 hours. Anyone feel like a drive?
Phaetons mental health is put to question in this episode. In addition to his suffering from auto mutation syndrome, one could find parallels between Phaeton and Hitler who was also reported to suffer from physical and mental disorders. In Hitler's case, he was either suffering from the late stages of syphilis or parkinson's disease due to his hands trembling.