Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title
Q: In Prometheus, for what reason did Weyland hide on the ship? When he finally revealed that he was in the ship, it turns out nothing happens, there are no particular consequences and the reason for the secrecy is unclear. Why didn't Weyland just inform the crew that he's also aboard in the ship?  Can someone explain to me, what are the reason for this?
A: 
Why does Weyland have to hide that he was on the ship?