When making a movie, everyone will do everything that they can to make sure the final product looks as good as it possibly can. Whether it's CGI, costumes, locations etc., everything on screen has to look as real as possible. However, despite everyone's best efforts, there will always be at least one aspect that requires the audience to suspend their disbelief.
And this is no truer than when a character has been recast. When someone rocks up on screen looking completely different to how they did before, you just kind of have to roll with it like nothing has happened.
We're not talking a recast in terms of complete franchise reboots, or the same character at a different age, we're talking full recasts of characters that by all logic should look (or sound) the same as they did before. It happens all the time, and while you would imagine this would be one hell of a hurdle for a movie to overcome, recent years have seen plenty of successful transitions from one actor to another.
10. Kathryn Newton As Cassie Lang - Ant-Man & The Wasp: Quantumania
When Emma Fuhrmann took over as Cassie Lang from Abby Ryder Fortson for Avengers: Endgame, it was easy to see why. There had been a huge five year gap since the last time she was on screen, and so when Scott Lang returned home from his involuntary quantum sabbatical, it wouldn't have made sense to find Cassie the same age.
What was more questionable was that Marvel Studios then recast the character again, with Kathryn Newton bringing Ant-Man's daughter to life in Quantumania. The studio rightly came under scrutiny for how the news was delivered to Fuhrmann (reportedly she found out at the same time as everyone else), but it was ultimately a strong decision.
Cassie was to assume a much different role in the threequel, and as a teenager in the MCU was required to be independent, awkward, sarcastic, and effortlessly charming. Fortunately, Kathryn Newton brought all of this and more to the role.
This recast seemed to signal that Cassie was set for a (excuse the pun) much bigger role in the MCU going forward, which seems as though it is barrelling right towards a Young Avengers team up. Simply put, Newton is a bigger name with more experience to bring to the franchise than Fuhrmann, though you do have to question whether Marvel couldn't have just cast Kathryn Newton in Endgame to begin with.