The story centers on Opus the Penguin (who was at the time one of the main characters in Breathed's comic strip Outland.
A misdirected Mars probe happened to give him the means to return to Bloom County, where he set about looking for his old friends.
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The final strip showed Opus fast asleep in bed on the final page of Goodnight Moon, Steve Dallas having opened the book in the previous strip.
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Goodnight Opus (ISBN 978-0-316-10853-9) is a 1993 children's book by Berkeley Breathed featuring Opus the Penguin.