This is also partially a book review because I read the book prior to seeing the movie. I saw a poster for this movie in a theater lobby, which intrigued me enough that I looked into more information about it. I found out that it was based on a book, Mickey7. This review contains some spoilers for Mickey 17 and The Substance.
Mickey7, book
The book was a relatively quick read. It was published within the last few years, so it's fairly recent. I thought the premise was pretty interesting, although the execution by this author wasn't my favorite. I would've found it more interesting if a different author had written something with this premise, such as Murakami.
Additionally, the book had a rather young-adult fiction writing style, which isn't my favorite. I prefer books that are a bit more literary in style, or at the very least, are not written in the style of YA, even if they're not high literature either.
Still, I found it interesting enough to finish and the concepts it involves are interesting to think about, even if the author could have approached them in a more artful and skilled manner. For some reason I don't feel like I can remember much detail about the book, even though I read it within the last week or two. I think that I wished it had addressed the premise/themes in a deeper way somehow, rather than being more surface level.
However, in some ways, the book did delve a bit deeper than the movie did. The ship of Theseus idea is specifically discussed in the book, and Mickey ends up using his spare time to read about what caused the success or failures of other space colonies, wondering what implications that might have for the planet he has traveled to. There's also some more depth in what's going on with the strange worm-like creatures inhabiting the planet.
Mickey 17, movie
This movie was directed by Bong Joon Ho and starred Robert Pattinson as the eponymous character, Mickey 17. I was curious about what the adaptation would be like. I have not watched any other work by Bong Joon Ho, or Robert Pattinson (aside from maybe some of the Twilight series, years ago. I was somewhat interested in the series around the ages of 10 - 13, which is when it was really popular).
The movie differs rather substantially from the book. Although there are similarities in some of the broader elements, much of the details were changed, including some of the plot. I was hoping that the movie would take a deeper approach to some of the ideas in the book, but this wasn't really the case. The movie went in a different direction than the book, and the themes and/or emphasis were changed.
Thematically and tonally, the movie was somewhat disjointed. There were a lot of different elements that just didn't get explored too deeply. Robert Pattinson's acting was very superb and he really managed to embody the two versions of his character. There's a certain intensity (and depth?) to his performance that reminds me of Peter Sarsgaard a bit.
I thought that Robert Pattinson didn't really look like I expected him to for some reason. My mental image of him is more like a vague recollection of what he looked like in the Twilight series, which is different enough than what he looks like in this movie and maybe in real life too. In this movie, his hair was darker and not as curly or tousled looking. In Twilight/etc, I think his hair was more coppery (lighter in color, I guess from highlights of some sort) and had a slightly curly texture. He also had vampire makeup for that series to make him appear very pale and sparkly. He was rather pale in Mickey 17 too, but not sparkly. He appeared very hairless (regarding body hair) in this movie, which I'm not sure if that's how he naturally is, or whether he was shaved and/or waxed to look like that. In any case, he's an attractive man.
Pattinson played his character rather straight and seriously, which is in extreme contrast to the caricatured performance that Mark Ruffalo gave as the movie's primary villain, the commander/caption of the space expedition. I found this juxtaposition rather disjointed and Ruffalo's performance and character seemed out of place with how the rest of the characters were portrayed.
I would have preferred to see a more subtle and sinister or ominous portrayal of the villain, instead of a bombastic, over-the-top demagogue. Although the movie was originally filmed a couple of years ago, Ruffalo's character is like a strange Trump-Musk amalgamation. I could actually see Peter Sarsgaard playing this role how I envision it, or maybe Jeff Goldblum? Perhaps even James D'Arcy. I'm not familiar with Ruffalo's other work so I can't really say whether he's generally a mediocre actor, or it's just this performance that wasn't great.
I also possibly would have liked if the movie had a different director, someone who'd emphasize the more surreal and deeper ideas/elements rather than trying to incorporate a significant campy, satiri-comical tone. Maybe someone like Darren Aronofsky?
The ending of the movie (which is a little similar to the book, but also has significant changes) was a bit contrived too. Ultimately, I don't think it necessarily benefited from the plot and other changes that were made in the adaptation, particularly the way the commander character was built into something rather different than the analogous character from the book, and the impact of that on the plot.
In an interview I read prior to seeing the movie, Pattinson did mention that he was surprised about how the director adapted the source material. It might be more enjoyable to watch this movie without having read the book first, because it doesn't feel like a highly satisfying adaptation of the source material. In some ways, the source material is rather corrupted in the adaptation.
I wish the movie had been more of a character study (of Mickey) since it would be an interesting way to explore the premise. It also would've benefited from more development of Mickey and Nasha's relationship, as well as the other woman that sort of almost gets involved in a love triangle. The book does this at least somewhat better, if I recall correctly.
I would have liked to see more reflection from both/either Mickey and Nasha about the strange situation with there being two of him and what they thought about it. In the movie, Nasha is eager to have a threesome with the twin Mickeys (the threesome also occurs in the book) and does notice the difference in their personalities. She describes 17 as mild Mickey and 18 as habanero Mickey, but doesn't end up addressing these differences further.
I thought it was interesting that there's a tenuous connection to the premise of The Substance, but Mickey 17 takes a very different approach to it.
The common premise in these two movies is the idea of having two bodies, which are two versions of yourself that are both technically supposed to be you, but they're at odds with each other in some way, and are different from each other in some way(s).
In Mickey 17, he ends up with two versions of himself unintentionally and is part of a larger crew of people in a space colony, whereas in The Substance, Elisabeth voluntarily takes a substance to create a better version of herself and is rather isolated personally. The Substance, overall, was much more expertly executed in terms of the direction and plot. I also enjoyed its allusions to Requiem for a Dream and some of Kubrick's work.
In both, it was interesting to see how the different bodies/versions of the character were foils for each other. Since the context and premise of the movies are pretty different, this foil effect plays out in distinct ways. Both Mickeys are physically the same, but differ somewhat in personality. Mickey 18 is more diabolical than the hapless and nervous Mickey 17.
Elisabeth is using the different, younger body of Sue to live vicariously, trying to relive Elisabeth's former glory. Her desire to continue living as Sue instead of Elisabeth ultimately leads to Elisabeth's destruction. Mickey 18 holds a bit of disdain and disregard for 17, and for some reason is more diabolical than his previous version. The reasons for him being more diabolical are never directly explained. Perhaps it's just a reaction to being confronted with a duplicate version of himself, putting them both at risk in the context of the ship's regulations?
Overall, I did like the movie and would probably watch it again at some point, it's just that are there some aspects of it I have criticism of and think should have been done differently. It was somewhat underwhelming relative to what I think/wish it could have been. I like
this review on Reddit that also discusses the differences between the movie and book.
I took a look at AO3 to see what fan fiction about the movie exists, though it seems like the majority of it involves clone sex because I guess people just wanted to get their freak on and write about that. Personally, I think that's one of the more uninteresting ideas that could be explored in fan fiction for this movie.