Swamp Thing, Vol. 2 #80 (1988)

The Longest Day
Before they can conquer Earth, an alien race must eliminate the lone threat to their plans of conquest...Swamp Thing. Written by Rick Veitch, with art by Veitch and Alfredo Alcala. Cover by John Totleben. Suggested for Mature Readers. New Format. Cover price $1.25.
Release Date: 1988