CBS is going to a a special colorized episode of I Love Lucy: "Lucy Meets Superman" on Sunday, May 17 at 8pm (along with an I Love Lucy episode set in California, "LA at Last")
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http://www.cbspressexpress.com/cbs-e.../view?id=42416
Contrary to popular rumor, the original airing did in fact credit George Reeves as the guest star (no one was worried about spoiling the fact Superman wasn't real)
But that was cut from the syndicated reruns with the "heart" opening and closing.