Princes Caroline is a character from the British television series Supercar.
She's also a "damsel in distress" - being held prisoner in a castle in her native Bovania. She could really use a "knight on a white horse," right about now...
...or, failing that, how about young American Jimmy Gibson (and his simian sidekick, Mitch), and the Marvel of the Age itself - Supercar!
Princess Caroline appears in the episode Flight Of Fancy.
She was voiced (as Jimmy was!) by Sylvia Anderson.