Furthermore, the Advanced PET toy (featured in "Axess") was imported in three available designs: blue/gray (MegaMan), red/black (ProtoMan), and black/purple (Bass). The Advanced PET II model was planned but never released. English Battle Chips were packaged with nearly every piece of "MegaMan NT Warrior" merchandise, but chips could also be bought separately in booster packs. Japanese and English Battle Chips will work on either Japanese or English versions of the PETs, although only the Progress PET featured backwards compatibility with previous generations of Battle Chips.