Despite this statement, Big has continued to appear in other titles, including "Sonic Runners", "Lego Dimensions", and "Team Sonic Racing".   is a Chao mutated by the Chaos Emeralds that acts as a guardian for its species, protects the Master Emerald, and provides clear water around its altar. It is a water-like being that can easily manipulate its body. Without any Chaos Emeralds, it is known as "Chaos Zero", but with each Emerald it absorbs, it transforms into a more powerful form, eventually becoming "Perfect Chaos" with all 7 Emeralds. Its first appearance is in "Sonic Adventure", where Dr. Eggman attempts to use it to conquer the world. Chaos tracks down the emeralds, becomes "Perfect Chaos", and floods all of Station Square, but is ultimately defeated by Super Sonic. It reappears in "Sonic Adventure 2" as a bonus multiplayer character, in "Sonic Battle" as a playable fighter, and in Mario & Sonic at the Olympic Winter Games as an ice version of Perfect Chaos. He reappears in his perfect form in "Sonic Generations" as a boss where he has a new look with green teeth and dark blue reptilian skin for the upper half of his body. This was supposed to be how he always looked, but the technology of the Dreamcast at the time made this look impossible. Chaos appears as the final boss in the Sonic the Hedgehog pack of "Lego Dimensions". The E-100 Series is a group of robots created by Doctor Eggman, who uses them in his quest to conquer the world; However some of their members have since gone rogue.   better known as Zero, is the first of the E-100 series and considered the prototype of the line. He was created by Dr. Eggman and ordered to capture the Chaos Emerald from Amy Rose's Flicky friend, Birdie. He first appeared in "Sonic Adventure" as the main antagonist in Amy's story, where he repeatedly tries to capture Birdie. At the end of Amy's story, she destroys him. In "Sonic Advance 2", he appears in special stages, trying to prevent players from getting the seven Chaos Emeralds.   also primarily appears in "Sonic Adventure". He is a red, bulky robot with a powerful gun built into his arm. Gamma turns against his master after a heartfelt conversation with Amy Rose, who becomes his friend. He offers shoot-'em-up gameplay to a largely platforming-focused game.