User blog comment:Darkcloud1111/Official "The Sea of Monsters (movie)" Discussion/@comment-6064271-20130401224539/@comment-2079715-20130403105620

Just as I said in some earlier posts. Fox gave Columbus chance to film a single movie, without sequels. He did what he could with what they gave him. Independently from books, TLT atracted some fans. My girl friend watched the movie and is now anxious for the sequel. Might even convince her to read books. :)

In short. Columbus never planned on sequels. Fox ordered sequels when TLT actually MADE some money.