I want to preface this I'm aware of the Army of Darkness game for iOS and Android. Yes, there are several Evil Dead games including the new Ash Vs Evil Dead/Halloween one. Obviously Army of Darkness wasn't popular when it came out. Still they made games based on Cool World and James Bond Jr. It wouldn't be out of the realm of possibility.

Now that that's out of the way hypothetically if a game for Sega Genesis and Super Nintendo had been made I could see these being the levels.

Level 1: The Cabin Ash has to collect all of the pages of the necronomicon and open a portal. He also has to fight his evil hand and an assortment of deadites. Once he finds the pages a portal opens. This triggers the cutscene showing Ash getting sent back in time.

Level 2: Getting Medieval Ash is captured and led back to Arthur's Castle. He fights an assortment of knights using his fist and a sword. Inevitably he gets knocked into the pit where a boss battle with the pit witch ensues.

Level 3: Arthur's Castle Ash has his relaxation time interrupted after the witch turns. Ash fights deadites in the castle and the witch is the boss fight for the level.

Level 4: Evil pursues This is a side scrolling horse riding level. Ash has to jump obstacles and stay ahead of the Evil chasing him. A bar at the bottom shows Ash's progress and where the evil is. If the Evil catches him he loses a life and it shows a still from Evil Dead 2 of possessed Ash.

Level 5: The Windmill Ash has to fight off deadites and little Ashes are the boss battle. The tiny Ashes use the shotgun, throw kettles, etc.

Level 6: The Graveyard Ash fights skeletons and eventually Evil Ash in the graveyard. A cutscene shows Ash getting the book but saying the wrong words. Evil Ash comes back and laughs before setting off to Arthur's Castle.

Level 7: the Castle Gates Ash fights deadites on the way back to Arthur's Castle. The winged demon is the boss. A cutscene plays where Shelia gets captured and taken by the demon.

Level 8: Deathcoaster Driving level where Ash drives through skeletons and deadites. Possessed Shelia is the boss of this level. A cutscene shows her turning back.

Level 9: Castle walls Ash has to get to the book in time before Evil Ash. A progress meter shows how close Evil Ash is to the necronomicon. Evil Ash is the boss in this level. When he's defeated a cutscene plays of him getting launched and exploding.

Level 10: S-Mart Ash fights deadites in the department store while riding on a cart and shooting a rifle. The possessed woman in S-Mart is the final boss of the level. The level ends on a cutscene of Ash kissing the redhead woman and saying "hail to the king baby!"

This is my idea for how an Army of Darkness game should be structured. 10 levels total some side scrolling and some driving stages.