DC Comics back then use the strips to test out ideas, which if they were a hit were then introduced into the canonical comics.
One of the most famous examples was Titano the Super-Ape, who was introduced in the strip with a different name before he appeared in the comics.
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Wasn't Myxzptlk (sp?) also in the comic strip first?---Al
I belive so, however I only remember this from a article that I read, I don't own any of those strips. Quite a few characters and storylines ran in the strips 1st.