Most often, transmedia stories are based not on individual characters or specific plots but rather complex fictional worlds which can sustain multiple interrelated characters and their stories. This process of world-building encourages an encyclopedic impulse in both readers and writers. We are drawn to master what can be known about a world which always expands beyond our grasp.  […]

Transmedia storytelling expands what can be known about a particular fictional world while dispersing that information, insuring that no one consumer knows everything and insure that they must talk about the series with others (see, for example, the hundreds of different species featured in Pokemon or Yu-Gi-O). Consumers become hunters and gatherers moving back across the various narratives trying to stitch together a coherent picture from the dispersed information.

Source: Transmedia Storytelling 101 — Henry Jenkins