Gorilla Grodd on the Planet of the Apes

 

I think that I may have seen this match up suggested in the comments, and it really is a natural one.  I had to look up to see which intelligent ape civilization came first, PotA or Gorilla City.  To my surprise, the comic book version debuted first, in 1959, while Pierre Boulle's Apes novel came out on 1963.  I wonder if Boulle was a comics fan?

Nightwing Vs. Electro

It was cool to see Jamie Foxx get another chance to play Electro, especially with the redesign that he was given.  The nerdy, obsessed with Spider-Man version from his original appearance was a little too close to the Jim Carrey Riddler origin from Batman Forever for my taste.  Even better than the attitude change was the updated look that he received.  I loved how the energy crackling around him would form the classic star-shaped helmet when he let loose with his powers - a great way to get that tough to pull off design in there.

Moonstone Vs. Harley Quinn

 

Here's a match up that I am surprised that nobody has suggested before, because it feels like a natural.  Both are villains with backgrounds in psychiatry and have each found themselves fighting on the side of good from time to time.  Despite those similarities, I am betting they would not get along at all, given their personalities.  One has a cold, calculating demeanor while the other's is crazy and unpredictable.  I'd love to see this battle done for real.

The Unknown Soldier and The Winter Soldier

This cover is another suggestion form comics historian and Patron of this blog, Marc Tyler Nobleman, and one that I was surprised that I had not done yet.  I expect that by the end of the upcoming Black Panther movie, Bucky Barnes will be released from his stasis tube, because I have read reports that he will be fighting alongside T'Challa to fend off the forces of Thanos and protect Wakanda during Avengers: Infinity War.  That sounds like an awesome sequence.