When creating a hand-drawn animation, the animator that drew various stages of the animation so that other animators could infer what needed to be drawn in the other frames was known as an inbetweener.

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The animator who drew the key stages of animation was known as a key animator or lead animator, not an inbetweener. Inbetweeners were responsible for drawing the frames in between those key frames to create smooth motion.

When Creating a Hand-Drawn Animation, the Animator That Drew Various