Superman: Time and Time Again finds Superman traveling through time, bouncing between the Stone Age and 30th century.
At the beginning of this story, a time-traveling bounty hunter from the future, named Linear Man, wants to return Booster Gold back into his own time and era. Superman tries to intervene and stop the Linear Man but gets drawn into the time stream. Finding a way out of the time stream and mystery he is sent into a different time and space every time he is exposed to powerful explosions.
During his journey through time and space, Superman encounters many friends and foes including Chronos, Etrigan the Demon, the Justice Society, as well as 3 different versions of the Legion of Super-Heroes. While finding a way out, Superman fights T-Rex in the Stone Age, Nazis during World War II, and in the fat future, he is trapped in a museum of the 20th Century.
