His lost brother in space — Episode 17

Timothy, adopted by wealthy Snyder family, grows up devoted to three older sisters, until biological son Matthew returns and turns them against him with lies. Exiled and blamed for crimes never committed, Timothy still repays kindness: saves them, sacrifices self, volunteers for Project Hail Mary to find new planet for humanity. Only after departure do Snyders discover Matthew's schemes and Timothy's sacrifices. Thirty years later, Timothy triumphs on Artemis, honored as hero, while grieving family lives with cost of betrayal.