
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.
Alien Force was introduced in 2010 and currently consists of 6 sets. As of today,
8518 Jet Ray is the most valuable Alien Force set with an estimated new/factory sealed value of $85.
Summary
Ben 10 Alien Force Humungousaur set 8517 was released on December 30, 2009, retailing for $15, it has since been retired. New, unopened sets are valued at $59, while used sets sell around $12.
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