In the finale of Invincible Season 4, Mark Grayson confronts Thragg and makes the decision to return to Earth. However, the episode does not depict his landing, leaving viewers uncertain about his arrival. Instead, the story alternates between Mark's space journey and developments on Earth involving characters like Cecil and Debbie. Mark's return is tied to a deal with Thragg, suggesting that while Earth may be safe for now, the threat from the Viltrumites continues. Throughout the season, Mark grapples with psychological instability, experiencing hallucinations and visions that reflect his trauma from the conflict. The narrative implies that Mark's return is not a resolution but rather a shift in the nature of the threat, as the Viltrumites remain a covert danger. Overall, Season 4 ends with a sense of ongoing tension, hinting that the conflict with the Viltrumites is far from over.