TX-20 was a tactical droid stationed on the Ryloth city of Nabat during the Clone Wars. A strategic planner like all tactical droids, he used the Twi'lek prisoners there as a living shield to prevent the Republic from taking the city. Those same prisoners tore TX-20 apart after they were freed by Obi-Wan Kenobi, who along with Waxer and Boil used a covering assault by Commander Cody to evade the droid's attention.
TX-20 is the only tatictical droid in lego. He shares his legs and arms with other separatist droids but his combined head/torso piece is unique to his figure. Unlike other tactical droids, TX-20 has no unique decoration