Telly Monster, known usually as just Telly, is an eternally worrying, red-violet monster Muppet on Sesame Street. He is puppeteered by Martin P. Robinson. On his debut in 1979, he was known as the "Television Monster", a character that was fixated on television. He was violet-red and had antennae standing out of the top of his head, and his eyes would whirl around when he watched television. After that stint through season eleven, producers worried that he would be a negative influence on their easily influenced viewers, and changed him into the worry-wart character that he has been ever since.