Enemy Without a Face Buzz Lightyear of Star Command : Season 2 Episode 6

The Rangers are caught in a gravity field of a planet. It turns out to be an ancient defense system and the planet seems devoid of life. Soon they discover they are not alone...there are two survivors of an ancient war left alive and they are intent on killing each other. It seems they are being manipulated by parasitic creatures which bring out aggression and anger from their hosts. Soon the Rangers are overcome by the creatures and begin fighting amongst themselves. Only robotic XR is immune.