For Sonic & All-Stars Racing Transformed, the Speed Star's Car, Plane and Boat design was developed by artist Richard Tawny with the help of Scott Robertson (Design Studio Press) to feel like a true speedster capable of racing in any world, real or otherwise. The car was developed in Modo and was iterated many times between Tawny, the Producers at SEGA Europe and Sonic Team in Japan.
In Sonic & Sega All-Stars Racing the Speed Star is a blue convertible. In the middle, it has two equal-sized depressions in both sides. On the bottom, it has a clean large white lining. Six "spikes" appear on it as well two on front with mirrors infused in each of them, along with four on the back, accompanied by two on the back. The bottom ones have taillights that have two sections; orange topped with yellow. On the front, it has Sonic's head from the "Sonic Team" logo. Below that are three head lights. The main one is a large, almost obtuse "U" shaped clear section with four bulbs inside it, two built on the right and left stacked on one another, and the other two headlights are on the bottom front on the car built slightly more into the vehicle one on the sides, a yellow bulb encased in white around a black surface. The back on the vehicle has two yellow top-white exhaust pipes around black casing. The wheels of the vehicle have an orange outer ring, a red middle ring, and a white inner ring around a red circle. The words "SONIC THE HEDGEHOG" appear on the tires.
Car mode: In comparison to its original incarnation, the Speed Star has less spikes and a slightly bulkier appearances, with harder edges and spoked wheels. Also, only two spikes remain on the chassis, above the rear wheels, each with a vent in the back.
Plane mode: In its plane form, the Blue Star resembles a fighter jet, with a more streamlined, triangular shape including flat, angled wings across each side of the vehicle and a nose cone with two turbine engines attached.
Boat mode: In its boat form, the Blue Star resembles a speedboat, with two bright red motors on the back and a large fin on the back resembling one of Sonic's quills.
In Team Sonic Racing, the Blue Star was vastly redesigned, with a slightly less bulky appearance and slightly less curved back, resembling more of a contemporary car design. Additionally, the then cartoonish-looking red alloy wheels have been replaced with more realistic-looking wheels, with a distinct sheen.
In Team Sonic Racing, the Speed Star appears as Sonic's race car. In this game, its basic statistics show it has high boost and speed, moderate acceleration and steering, and low defense. However, its statistics can be modified by replacing its parts. Its artistic design can also be modified.
During the events of the game, the Speed Star was one of the cars Dodon Pa gave Sonic and his friends so they could compete in his Grand Prix competition. Sonic would afterward used it during the races and challenges he participated it. However, the Speed Star was eventually destroyed when the heroes had to leave it aboard the crashing Final Fortress. Fortunately, Dodon Pa promised to replace it with a new one.