Amazon announced on Tuesday it’s exclusively adding “thousands of TV episodes from Viacom to Prime Instant Video.” The content is mostly kids programming, with shows like Dora the Explorer and Blue’s Clues. Those are coveted shows for streaming services, and up until late May they were on Netflix. Amazon has also snagged up other Viacom properties more attuned to adults, including Tosh.0 and several other shows from MTV and Comedy Central. A source close to the deal characterized it as amounting in the hundreds of millions of dollars, though an exact figure wasn’t disclosed in Amazon’s announcement. It is a “multi-year, multi-national” agreement and the largest video deal Amazon has ever landed — both in terms of cost and in the number of episodes it’s added to its libary in a single shot.