Demolition derby racer
Fishtail is one of the opponents Lightning McQueen and Cruz Ramirez face at Thunder Hollow. At one point in the race, he rams into Pushover, causing him to flip and land on top of Arvy Motorhome. Fishtail is last seen with Broadside just before Dr. Damage and Faregame are eliminated from the competition. He is presumably knocked out of the race as well.