Ep. 12: Speed encounters a mysterious car linked to the Three Roses Club's past victim during a test session.
Aired on June 18, 1967

During a test session, Speed is overtaken by a mysterious car numbered X3. The Three Roses Club recognizes the engine hum as belonging to a vehicle driven by a racer they killed years earlier in a mountain race. The driver is revealed to be a robot repeating the prerecorded warning, "Melange still races." This setup is the work of Flash Marker, the son of the deceased racer. Flash has vowed to destroy the Three Roses Club at the same mountain course where his father was killed, using the robot to deliver his message and initiate his revenge against the gang responsible for his father's death.
Episodes
- Ep. 8 · Speed and Trixie escape the Mammoth Car drivers and confront Cruncher Block at his mining tunnel headquarters.
- Ep. 9 · Speed Enters the Dangerous Great Alpine Race Despite Warnings from Sparky and Racer X
- Ep. 10 · Speed faces a deadly mountain curve and treacherous chasms during the dangerous race
- Ep. 11 · Speed survives with concussion and blindness while Racer X fakes injury to help him.
- Ep. 12 · Speed encounters a mysterious car linked to the Three Roses Club's past victim during a test session.
- Ep. 13 · Lilly drives the rebuilt Melange to target the Three Roses Club members
- Ep. 14 · Speed and Spritle face false blame and rebel capture in the desert race
- Ep. 15 · Speed and Kim Race Without Brakes Amidst Rebel Treachery in Flat Hill Country
- Ep. 16 · Speed Racer Invited to Kapetapek's Volcanic Underground Race Amid Political Tensions