Shelby the tortoise

"Some may mock this turtle for her average jumping and crushing abilities, but what they don't realise is slow and steady wins the race. Under Shelby the tortoise's tough exterior lies a turtle in a half shell with super high health. The only shell game Shelby plays involves crushing block after city block in Frisco"

~ Official Rampage: Total Destruction description ~

Background
Shelby drank some Scum Soda and had a violent reaction, and turned into a giant tortoise. Scumlabs caught her and put her in a Cryo-Tube after she went on a rampage.