Besides G.I. Joe, the most famous cover work that Mike Zeck did was on Captain America at two different points. Once when he was the regular artist with J.M. DeMatteis, and later on in the 80s when he just did covers during Mark Gruenwald's run.
Here are the top five covers from that time period!
A nice use of contrasting colors.
Incredibly dynamic cover.
A classic shot of mortal enemies.
A wonderfully serene Cap.
A classic action shot - a really appealing image for a cover - very colorful, too.
A striking use of the targeting of the gun, and coupling it with how gross Deathlok looks, the cover really pulls you in.
A very interesting visual approach.
Go to the next page for the top three!