Flea Market Hunting: Star Wars

It is no secret that my son and I are addicted to Star Wars action figures! We probably own over 100 now (need to count them soon!). During our last trip at the flea market we had found Ben Kenobi and Darth Maul but also some others.

There is the AT-AT (or AT-ST) driver, an Ewok (probably Chief Chirpa),  Lando in disguise during Return of the Jedi (my son asked me for this one for a long time), a Shadow of the Empire soldier and some dude which sadly I have no clue as to who he is... anyone can help?!