Bio Lizard  

The Prototype of the Ultimate Life Form, バイオリザード

The original version is already quite concise and clear. However, I can certainly rephrase it for you while maintaining its meaning and length. Bio-Lizard was designed by Gerald Robotnik as a prototype for an immortal life form. Unfortunately, instead of becoming the ultimate creature, Bio-Lizard ended up being imprisoned by G.U.N. After his release, it was discovered that Gerald had used him in a plan to destroy Earth. Eventually, Sonic and Shadow stopped Bio-Lizard using the power of the Chaos Emeralds.