I think was can all agree that Sesame Street continues to be the most important show out there for kids. It's been around since 1969, but having aired for 48 seasons, there have obviously been a lot of changes. While many of the iconic characters like Cookie Monster, Big Bird, and Elmo remain on the show as regulars, there are a lot of characters that aren't as famous, some have even been completely forgotten over the years. It's often a subtle change, but when you really look at it, you'll realize that some of the characters you remembered have left