There are a lot of new and modified elements in DuckTales Remastered. One of the biggest features changed this time around is the game's story. For instance, players will encounter a brand new tutorial level that will introduce the characters and story, and there's a full-blown scene explaining why Uncle Scrooge needs to rescue Huey, Dewey, and Louie.
After telling Webby to wait behind, the trio run off and land in a trap soon after. Uncle Scrooge is, thankfully, more than willing to rescue the bunch.
Capcom producer Rey Jimenez discussed DuckTales Remastered's story changes with Siliconera:
[WayForward] really wanted it to feel like you’re playing the show. In the original NES version, you go in the UFO to find the remote control to open the area to get to the boss. You don’t really know why. The game doesn’t explain it well. In our version, before you even get to the UFO you see Fenton who is Gizmoduck and he gets kidnapped by the UFO. You’re going into the UFO to save him and find all of the parts in Gizmoduck’s suit. Once you get that all together and Fenton turns into Gizmoduck he’s going to escort you back to the area where the door was and he will blast everything out of your way and then blast the door out.
In the NES version, you fight a big rat and it didn’t explain why you’re fighting a rat on the moon. That’s explained in here because there are rats they’re experimenting on and you let them loose and that becomes the rat down there. Also, how does Scrooge McDuck breathes on the moon? We explain that as well.