"DreamWorks Dragons: Riders of Berk picks up where the feature film left off. The series follows the adventures of master dragon trainer Hiccup, his faithful dragon Toothless and his friends on Berk. Dragon training reaches new heights as our heroes unlock secrets about their dragons, explore wild frontiers and discover new dragon species, all while battling against fierce enemies they never dreamed existed." -- iTunes Store
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the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.