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The new season of The Expanse brings everything fans have come to love about the science fiction series: good characters, great world-building and a fascinating story about a future of humanity with all of our goodness and ugliness.

Season four introduces us to the crew of the Rocinante—James Holden (Steven Strait), Naomi Nagata (Dominique Tipper), Alex (Cas Anvar) and Amos Burton (Wes Chatham)—tasked with heading to the newly colonized planet Ilus. We also get the continuing adventures of Martian ex-Marine Bobbie Draper (Frankie Adams), who, after the significant changes at the end of season three, is living on a Mars that no longer seeks out military dominance. Shohreh Aghdashloo plays Chrisjen Avasarala, the new Secretary-General of the United Nations—basically the equivalent of President of Earth—as he fights for re-election. We also get to see our favorite Belters, Drummer (Cara Gee) and Ashford (David Strathairn). It’s a great cast.