This is a smarter-than-it-sounds sci-fi romcom, the kind Gen-Z kids would presumably dig. It sends a seemingly mismatched boy-girl couple – poor, hapless but good-hearted Walt (Cole Sprouse, from Riverdale) and super-competent but neurotic swot Sophie (Lana Condor from To All the Boys I’ve Loved Before) into space following their respective romantic partners who have already flown ahead to a much-coveted colony on Mars. So while the overall project is a heterosexual space-rom, along the way there are sprightly touches: thoughtful world-building (Earth, as in Wall-E has become one huge toxic garbage dump); snarky jabs at billionaire space entrepreneurs (Zach Braff co-stars as a capricious Elon Muskian tech overlord); and a cute lesbian couple with commitment issues (Cameron Esposito and Sunita Deshpande).