When millions of mysterious black-boxes appear overnight around the world, a year-long mystery begins for the Doctor and his companions to uncover their true purpose, before it's too late! With Amy and Rory battling with second thoughts of leaving the Doctor and his time-travelling Tardis behind, will the Doctor be left alone on this adventure or will the power of three prevail in the end once again? Lindalee Rose reviews the fourth episode of this latest season's Doctor Who episode.