Tik-Tok is the tritagonist of Return to Oz.
Tik-Tok is a very special and authentic robot man made entirely of smooth copper and is only as tall as Dorothy Gale who is described as no older than a twelve year old child. His body is completely circular and his torso is as round as a ball. His limbs are all jointed or hinged to his body with polished caps over the joints.
He runs on clockwork springs which periodically need to be wound, like a wind-up toy or mechanical clock. He has separate windings for thought, action, and speech. He is guaranteed to work perfectly for a thousand years.
Tik-Tok is unable to wind any of his keys by himself. He becomes frozen or mute or, for one memorable moment, continues to speak but utters complete gibberish. (The Road to Oz) In the Oz books, Tik-Tok is not alive and feels no emotions whatsoever. He therefore can no more love or be loved than a sewing machine, but as a servant he is utterly truthful and loyal and can never lie. He also has a monotonic, halting mode of speech: "Good morn-ing, lit-tle girl."
Return to Oz
Tik-Tok was a main character in the movie Return to Oz, adapted from Ozma of Oz. In the movie, he is the entire royal army of Oz, ironic considering his generally helpless nature. But throughout the film he shows great loyalty and camaraderie to Dorothy and the group, and his lack of emotions proved beneficial during dangerous events.