Cron, Thomas W. "The Man Who Saw the Omniverse"
Summary: A man and woman with superpowers visit various timelines, including one with a merged German/Russian communist state, one depopulated in the 1960s a bioengineered virus, and one where Atenism still exists in Egypt.
Series note: Sequel is "Guardians of Mankind".
Published: In Nova Science Fiction Magazine #2 (... 2000).

Cron, Thomas W. "Guardians of Mankind"
Summary: The two superheroes help out in other timelines, including one where Gary Hart is president in 2001, one where the Stuarts still rule England, and one where the Great Depression never ended.
Series note: Sequel to "The Man Who Saw the Omniverse".
Published: In Nova Science Fiction Magazine #5 (... 2000).