Thunderhead

Thunderhead Raceway is a racing track featured in the Speed Racer film (and the tie-in video game).

Background
It is one of many courses sanctioned by the WRL. Located on the outskirts of Cosmopolis, it is one of the last designed by racing legend Velocity Dewitt. It is made of 100% forged steel, presenting a slippery situation for drivers, especially when they hit the track's infamous "dog bowls". While it is the oldest track in Cosmopolis, it takes a true driver to conquer its twists and turns. It also features Dreadnought Jump, which is 30 meters in length and had spelled DNF for more than a few aspiring racers.

For years, late fan-favorite Rex Racer holds the course record for the fastest lap time at 9:18.65. The previous record before Rex was 10:01.42 by Clutch McNally. Before Rex left Racer Motors, he used to take his younger brother Speed to Thunderhead and letting him steer the Mach 4 while Rex worked the gas, brakes, and clutch.

It is also mentioned in the Supercharged featurette that Pitter Pat, who is sponsored by Razorback Depilatory, is frequently seen at Thunderhead, toiling for a spot in the standings.

Racers
There's a racer list in the movie, but it may be inaccurate because most of the sponsors on it do not exist outside of it, and sometimes racers are listed with the wrong sponsors (for example, Pitter Pat being from the "Jamison Jeaky" team instead of Razorback Depilatory).

The following list was done via analysis based on the last time each car was seen.

Videogame
The Thunderhead Raceway makes a return in the console, Nintendo DS and mobile versions of the videogame. The tracks are not consistent with the one from the movie.

Videogame
Below is a list of all the tracks that play in this event in the videogame:

Trivia

 * Thunderhead is one of the longest tracks in the movie. The world record, held by Rex Racer, was 9:18.65; even longer than the world's current longest track, the Nürburgring combined circuit, at 8:10.921 (by Kévin Estre).