|LEGO® → System → Exo-Force|
8104 Shadow Crawler is an Exo-Force set released in 2007 as part of the Golden City line. Included is a battle machine, a Green Devastator, and a skeleton. The skeleton is held inside of the translucent green prison pod on the back of the vehicle.
Shadow Crawlers were mass-produced robot battle machines, first used during the Golden City Era. They had the ability to walk on walls and, due to the large, bulbous pods on their back, could capture humans to take to the robot fortress. This was attempted with Ha-Ya-To, but ultimately failed when he was saved by Hitomi.