What's at the bottom of Elmo's rainbow? A video full of your favorite Sesame Street friends! There is a rainbow on Sesame Street, and Elmo can't wait to show Rosita, but when they return, the rainbow has disappeared! Their friends try to re-create a rainbow with artwork, multi-colored monsters, magic, and a fun science experiment, but it's just not the same. Will Rosita ever see a real rainbow? Learn more about rainbows, seasons, and bumblebees with your Sesame Street friends!