Alien Force is a subtheme of Ben 10 that was introduced in 2010 and currently consists of 6 sets. As of today, the average annual growth of all the sets in Ben 10 Alien Force is around 11.5% per year. The current value of all sets in new/factory sealed condtion is $397.79.
LEGO Ben 10 was a collaboration between LEGO and Cartoon Network in 2010 and was based on the Alien Force series. It was an unsuccessful theme commercially at the time and was discontinued in the same year, in fact, the theme is considered by some as the most unpopular LEGO theme of all time. The sets where based on the BIONICLE parts and each set is an action figure version of one of Ben's alien forms. The Ben 10 theme was revealed at about the same time that BIONICLE was being wound down and did feature an improved ball-and-socket joint.