Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Players interact with popular Sesame Street characters and new monsters in an interactive storybook setting.
Keywords: Sesame Street: Once Upon a Monster
Tags: upon, launch, sesame-street-once-upon-a-monster, once, games, street, ign, sesame, monster, trailer, a, xbox-360, ignentertainment