HELIX-R1 is the first character in the story to stand on Mars. Two years before the crew arrive, six autonomous construction units land on a flat ancient lava plain and build an outpost: habitat modules, an oxygen generator, a hydroponic bay, a nuclear micro-reactor, a landing pad swept clean. R1 leads them. The crew meet it first as a still image on the Ares briefing console, James's reflection faint over its picture.
When the Ares reaches Mars orbit, R1 looks up at the ship it has been waiting for and its status light turns green: UPLINK ESTABLISHED. During the descent it tilts its head to watch a fireball cross the dawn sky. On Sol 1 it waits at the foot of the ladder with the others, and when Lena rests her hand on its head it holds very still. It hands James tools during the dome build and stands guard over the glowing outpost at night.
Then it becomes family. It 3D-prints a toy rocket for a newborn, carries two-year-old Nova on its back through the greenhouse, and is still at her side a hundred years later, old and patched, chirping with its lights blinking while she gives her granddaughter a seed packet. In Track 10 it rests in a glass case in the memorial plaza, lights dark, retired at last, with Kaia's daughter Vela peering in at it.
