Darkseid is one of the central villains in the DC Universe. Upcoming movies will include the character, including Batman v Superman: Dawn of Justice.
An argument can be made for his first appearance being Jimmy Olsen #134. However, the first full story of Darkseid appears in Forever People #1, and Jimmy Olsen #134 is struggling at the moment. Prices on that book have fallen rapidly in most grades.
FP1 has an all-cream/white cover which makes it hard to find non-CGC copies in very high grade.
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