This is a list of episodes from the 1967 Mach GoGoGo TV series, released in the U.S. as Speed Racer.
When The Masked Racer, a mysterious race driver considered a dangerous jinx because of fatal crashes in past races, enters a major race, Speed becomes determined to face off against him, a determination that increases when The Masked Racer tries to dissuade Speed from entering – brought on because of the secret that the Masked Racer is in fact Speed's exiled eldest brother, Rex.
Speed foolishly challenges The Masked Racer to a dangerous pursuit in a driving rainstorm and when a crash ensues he is injured and taken to the mysterious racer's home to regain consciousness. When he awakens he notices an array of white roses, known to be the favorite flowers of his mother (the first hint of suspicion of The Masked Racer's identity by Speed). Trying on the man's mask, he is mistaken for The Masked Racer by gunmen for a rival team and kidnapped.
During a test session Speed is overtaken by a mysterious car numbered X3, whose distinctive engine hum is familiar to a vicious gang of racers known as The Three Roses Club because the engine is from a car whose driver they killed years earlier in a mountain race. When the mysterious driver turns out to be a robot who repeats a prerecorded warning, "Melange still races," it turns out to be the work of "Flash" Marker, the son of the deceased racer who has vowed to destroy the Three Roses Club at the same mountain course where his father was killed.
Dr. Nightcall and his daughter trick Speed and use the Mach Five to steal a device called the Mizmo beam and build another Mach Five for their boss Cumulus. In addition to the Mizmo beam, the duplicate Mach Five can sprout small wings allowing it to fly and contains an atom bomb.
Speed is training for the Super Car Race on the Snake Track which is a new course that has seven curves. After a day of training Speed meets Rock Force who outmaneuvers some gangsters by driving his car on two wheels. While talking to Rock Force Speed notices that the car has a special automatic transmission. After the gangsters wreck his car Mr. Force comes to Pops Racer to have it fixed. Speed and Mr. Force get into a fight and Mr. Force reveals that he cannot use his right arm and wears a metal brace on it. Mr. Force tells how he accepted money to throw a race but won it anyhow. The gangsters then crippled his right arm to prevent him from racing and have now wrecked his car. While Pops fixes the car Speed challenges him to drive the Mach Five with its manual transmission to help 'wake up' his right arm. The next day Mr. Force wins the Snake Track race but the gangsters come forward and reveal that he cannot use his right arm. Mr. Force proceeds to punch out the gangsters and Speed grabs his arm. They then both realize that he punched out the men with his right arm; his arm has completely healed. The racing official then chastises the gangsters for lying to him. Speed then tells his friend Rock that he will beat him the next time they meet.