Spot is a pig that lives inside Oscar's trash can.
He appeared on Sesame Street in a 1985 episode, where he was played by a live pig. Later on, Spot was seen as a Muppet in a 1993 episode as one of the animals making noise so Oscar can forget the "Sesame Street Theme" lingers in his head.
Spot later became an unseen character for several years. Although not featured on screen, in Episode 3782 Spot was said to be lamenting the absence of fellow-pet Slimey (who went to the moon); and he was heard using a jackhammer to help get Curly Bear to take her nap in Episode 4078.