The Extremes are a singing group of unnamed alien-like creatures who appeared on the first two episodes of The Jim Henson Hour, performing "Neutron Dance" in episode 101 and "Maneater" in episode 102.
The four Extremes are:
- Purple Extreme: Sharon Lee Williams
- Yellow Extreme: Steve Whitmire
- Blue Extreme: Kevin Clash
- Orange Extreme: Jerry Nelson
Various members of the Extremes also popped up occasionally on Muppets Tonight. In episode 101, Nigel tells the crew to run the tape of the Koozebanian dance number, which features members of the Extremes, suggesting that they may be from the Planet Koozebane.
- "Alien Opera"