Instructions: Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
Input: How did another Engineer ship with a chest-burst Engineer and lots of facehugger eggs end up on LV-426 (Alien) when all Engineers are supposed to be dead before David created the first facehugger eggs himself? Wasn't the idea of Xenomorphs shown to exist before Alien: Covenant (2017) by the murals in the Ampule Room on the ship on LV 223 in Prometheus which might explain who piled up the bodies of Engineers on LV 223?
Output:
How to explain this in Alien and Prometheus considering Alien Covenant plot?