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The Triple Changers are a class of Transformers so called because of their ability to convert into any of three different modes.
The first Triple Changers introduced were the Decepticons Astrotrain and Blitzwing, who would be joined by Octane in the third season of The Transformers. Autobot Triple Changer Springer was introduced in The Transformers: The Movie, and later joined by Broadside and Sandstorm in season three. The short-lived fourth season of the American series and the Japanese-exclusive Transformers: The Headmasters would also feature additional Decepticon Triple Changers, the Horrorcons, who were also Headmasters.
The Beast Wars sequel series also featured the Transmetals, who-with the exception of Optimal Optimus and Primal Prime-were all Triple Changers as well, each possessing a modified Beast form in addition to Beast and Robot modes.
In Transformers: Rescue Bots, Heatwave temporarily becomes a Triple Changer after learning from Optimus Prime how to scan an additional form, taking a fire boat alternate mode. However, he later gained a fourth mode while Optimus and his fellow Rescue Bots became-so far as was seen on screen-Triple Changers, each of them assuming a Dinobot alternate form.