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Rocky Is Weirder Than You Think (ft. Andy Weir!)

Joe Scott | May 16, 2026



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Project Hail Mary opened in theaters last week, introducing the world to Rocky, the alien creature whose friendship with the main character, Ryland Grace, forms the heart of the story. Rocky quickly became a fan favorite of readers of the book, partly because of the extensive research and imagination put into the creature by the author, Andy Weir. In today’s video, I have Andy Weir join me to break down everything you could possibly want to know about Rocky, from his (not so) fictional planet to his crazy anatomy. It’s a masterclass in speculative biology that will amaze amaze amaze you.

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TIMESTAMPS
0:00 – Intro
3:15 – About The Eridani System
7:10 – Morphology
18:04 – Crystal Brain
20:44 – Digestion
24:19 – Circulation/Musculature/Dormancy
28:37 – Communication
35:00 – How They Brought Rocky to Life
38:16 – Sponsor – Incogni

Written by Joe Scott

Comments

This post currently has 39 comments.

  1. @MobiusEye

    May 16, 2026 at 9:23 am

    Because of you, Joe, I bought "Project: Hail Mary" on Amazon Prime. I can't express how happy I am that I purchased it, not rented. This movie is high on my rewatchlst list. Princess Bride and Paul, high.

  2. @SarahJSweetheart

    May 16, 2026 at 9:23 am

    Im SO GLAD you mentioned starfish, as thats what i first thought (more than spider or crab) not due to the 5 legs, but the eating scene (if you dont know, a starfish's mouth and butthole is one of the same 😂)

  3. @SarahJSweetheart

    May 16, 2026 at 9:23 am

    Them mentioning that the turquoise marks arent birthmarks but rather tattoos makes me CRAVE a scene where Rocky and Grace compare tattoos, Rocky being like "Yes, this is indelible mark on Rocky body to show eternal undying love to Rocky mate", when Grace is more like "This is Mickey Mouse. I got him when i was drunk in Flordia" 😂

  4. @KrisSchall

    May 16, 2026 at 9:23 am

    Interesting, I immediately understood Rocky not wanting to be seen eating because it's also watching him take a dump and I would hate someone watch my take a dump. Didn't occur to me the whole eating together could be weird. But us eating together is a sign of sharing resources. So it mskes sense for community. Crappy away makes sense as vulnerability and disease spread.

  5. @buddywhatshisname522

    May 16, 2026 at 9:23 am

    I admit that I’ve been reticent to watch the movie since reading the book. It’s so rare to find a film that faithfully captures the essence of the story as built in your imagination. That being said, I can’t wait to see Artemis turned into a movie. lol

  6. @Fuzzy6262

    May 16, 2026 at 9:23 am

    Disclaimer: This movie was great, I've never made a movie, and do not think I could have done any better.

    After discussing this movie with a coworker, she sent me this video, mostly because I was a little disappointed with the personification of Rocky. Physiology aside, because let's be honest that's just about any aliens save from Avatar maybe, Rocky felt like a human stuck in a rocky body. It was the near immediate "isms" for me. Understanding and riffing off the human sense of humor out of the gate, lifelong monogamy, and generally the instant click of comradery. Culturally, the only thing that stood out to me was the Dormant Sleep State and having someone watch guard. The scene that really took me out of it is when Rocky comes rolling in like an excited toddler (or dog) with no sense of the damage he could be doing to Grace's ship, life support, lab capabilities, as though he's not a genius engineer/scientist. After finishing the movie it occurred to me the personification and funny/cutesie things they did with him are solely to create a bond with the character, so that certain events have more impact and gravitas. Overall, easily a 8/10 for a movie, I just felt like if you're trying to introduce a strange new alien, to the point you have 16 pages of how interesting and different they are, exemplify this in the story so that sense is conveyed appropriately. So much explained here has me feeling like had the movie introduced even half of this, just through curious casual conversation between the two of them, it would have really broken Rocky out as an alien being with alien thoughts and an alien way of being.

    Great video, thanks for putting this together for us!

  7. @malachiXX

    May 16, 2026 at 9:23 am

    Joe,
    In the book, do they explain HOW Rocky and his people noticed that their star is sick and dying?
    If they didn't discover radiation until they got to space, they don't have eyes and they 'see' by echo-location, how did they detect a change in their star? In a vacuum, Eridians would be completely blind and it would be terrifying to discover that all 'vision' stopped at the edge of their atmosphere. At first, wouldn't they think that was the extent of their universe?

  8. @RipArtist

    May 16, 2026 at 9:23 am

    I loved this movie! Definitely the best sci-fi movie to come out in a long time. I haven't read the book yet but it's definitely next on my list. I nearly watched this video before watching the movie. I am so glad I waited. Watching this after the movie was the perfect order for me. This video perfectly compliments the movie. Well done! ❤

  9. @RicoLouis4u

    May 16, 2026 at 9:23 am

    One problem with the no spatial memory thing. Spatial memory not only covers what's in the room around you but long distance navigation. I know the erdians can hear pretty far but how would they keep track of locations. Animals evolved it to remember where edible plants and water can be found and predators remember where they found prey. Clearly they have to have something similar for long distances over their planet so i think saying no spatial memory is a wrong way to put it.

  10. @Jhawke

    May 16, 2026 at 9:23 am

    Seeing Andy's worldbuilding notes makes me feel better about my own 118 pages worth of (disorganized) worldbuilding notes that go into far more detail than strictly necessary – most of which no one except close friends will ever see.

  11. @michellesteimle9969

    May 16, 2026 at 9:23 am

    I saw the movie after my brother told me it was based on a book written by the same author who wrote The Martian. I went in without watching ANY previews and with zero idea of the plot. I had such a fun time. I saw it twice in the theater because it was SO GOOD. Then I listened to the book and enjoyed all the extra details they couldn't put into the movie. This is one reason I prefer to see the movie and then read the book. I have a hard time with what gets cut out of the book otherwise.

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