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Late 90's Cartoon Network managed to buy out, then air this self-aware ad on Nickelodeon promoting their "Cartoon Cartoon Fridays" block.

As usual, Johnny here has some interesting shapes whenever he quickly poses.

Edd's linework is pretty stable compared to his origin show.
Steven Taylor features this on his portfolio. His CV page lists his work on Cartoon Network teasers as "Senior Animator 2D" and only lists his work in Hanna Barbera as in-betweener, so I feel it’s safe to assume he key'ed this. No idea if he did it alone or not, though.