G.I. Joe: A Real American Hero: Slaves of the Cobra Master [1983 Mini-Series : Episode 2]

The Joes begin the race to acquire the elements necessary to build their own MASS device. Cobra kidnaps Duke, using mind control device to put him in a gladiator type environment called the Arena of Sport. After Cobra discovers the Joes are searching for radioactive crystals, the race begins. Snake Eyes sacrifices himself to save his friends, acquiring the crystals while he is poisoned from the radioactivity. Duke is able to break the mind control device and is rescued by MEDEVAC.