sharpshooters ruth negga, tessa thompson, or jasmine cephas-jones as this girl's sister who settled for a mediocre man and might be running away from that, daveed diggs or kid cudi as her much cooler older brother, he could do anything on that space ship and lyra would think it's the greatest thing ever. emmy raver-lampman, phillipa soo, leslie odom jr, ariana debose as misc. space station staff. the cast of julie and the phantoms as adorable 4th year cadets. jake gyllenhaal just because who doesn't want to look at his gorgeous face all the time? either hunter schafer, jacob elordi, or angus cloud as a childhood friend from terra?