Terrific Trucks

The Tricky Twin / The Difficult Day (1x17)

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In "The Tricky Twin," when Blinker's twin sister, Zippy, shows up at home base, it's clear the two of them are used to having fun. In "The Difficult Day," Stotz is keen to help out in any way he can, but his skittishness about getting dinged and dirty leads him to bow out at the last second.