WE'RE BACK BABY!!!
What makes a sequel series distinct from a spin-off? In the opinion of the professor, a sequel series should continue the story of the original series, either literally or thematically, in some way. A spin-off carries over characters into a new story, usually with a change in style and tone.
The season 2 premiere of It Needs to Be Catchy examines sequel series through the lens of their theme songs. Listen as various programs try - and mostly fail - to recapture the comfort signal of their glorious ancestors.