If you loved Jim and Frank’s daring journey across the Martian wilderness, you’ll be drawn into Podkayne of Mars. Podkayne and her brother embark on a space voyage that quickly turns into a high-stakes adventure with clear objectives and escalating risks. You’ll enjoy the tight, goal-driven plot and the sense of peril and accomplishment that echoes the spirit of Red Planet.

If you enjoyed the dynamic friendship between Jim, Frank, and their Martian companion Willis, you’ll find similar camaraderie in The Wonderful Flight to the Mushroom Planet. Two boys, David and Chuck, team up for a secret interplanetary mission that’s full of teamwork, resourcefulness, and the joys of discovery—with a memorable non-human friend along for the ride.

If Jim’s journey from a rebellious student to a courageous leader resonated with you, you’ll be captivated by Ender Wiggin’s transformation in Ender's Game. Ender faces intense trials at Battle School, growing from a gifted but uncertain boy into a strategic and empathetic leader. The story’s focus on character growth and coming of age will give you the same sense of satisfaction.

If you were fascinated by Heinlein’s depiction of Martian life and culture—especially the unique biology and customs of Willis and his kind—A Door Into Ocean offers a deeply immersive alien civilization. The world-building is intricate, with a society of intelligent, aquatic aliens whose lives and values challenge human assumptions, providing the kind of detailed world you enjoyed in Red Planet.

If you appreciated the upbeat tone, clever banter, and hopeful spirit as Jim and his friends face peril, you’ll love Have Space Suit—Will Travel. Kip Russell is an enterprising teen who finds himself in a cosmic adventure, meeting danger with determination, humor, and heart. The tone is optimistic and fun, making it a great match for your tastes.