At his core, HEAVYTREAD is a gentle soul. He enjoys the fragile beauty of Earth, appreciating it all the more because of the ease with which it could be ruined. He is glad of the power he now wields, because it gives him the ability to defend the delicate creatures he loves.Power up for the ultimate robot battles! Your HEAVYTREAD figure is already a virtually unstoppable opponent in his vehicle and robot modes. But his strength gets doubled when you factor in your GROUNDSPIKE figure and his four modes! Convert this MINI-CON ally figure to weapon accessories for him when hes in tank vehicle mode or Commander mode. Then, convert your GROUNDSPIKE figure into an armor accessory for your HEAVYTREAD figures Power Up Mode! And the action doesnt stop there. With this Power Core interchangeable robot combination system, MINI-CON figures and drone vehicles (sold separately) can attach to power up any Commander figure. Collect more packs and you can create tons of unique and fierce robot battler figure combinations!