Sesame Street's been invaded by dinosaurs! Join everybody's favorite little red monster, Elmo, as the ever-inquisitive youngster journeys through the fascinating world of dinosaurs and learns everything he can about the prehistoric creatures. Then, Elmo, Abby Cadabby, Telly, Dorothy and Mr. Noodle all imagine themselves as dinosaurs and find out exactly what it's like to be an Elmosaurus or a Telly Rex.