A while back, we told you about the upcoming 'Muppets: The Green Album,' and mentioned that rockers OK Go would be among the artists revamping classic Muppet songs.

The group dropped their video for 'The Muppet Show Theme Song' this morning, featuring some very special guest stars.

It's every bit as trippy as you'd expect -- even paying brief homage to the guys' famous treadmill video for 'Here It Goes Again' -- and features cameos from popular Muppets such as Beaker, Fozzie Bear, Gonzo, the Swedish Chef and of course, Kermit the Frog and Miss Piggy.

Take a look:

[via Laughing Squid]