Elmo and Abby find out it can be easy being green when they stumble onto the Earth-a-Thon, hosted by Mr. Earth, happening right on Sesame Street. Telly, Rosita, and Cookie Monster answer phone calls from children calling in with pledges to reduce, reuse, recycle (and possibly send cookies to Cookie). But what happens when Abby uses her magic to help Elmo be really "green"?
| Actor | Role |
|---|---|
 Kevin ClashElmo (voice) | Elmo (voice) |
 Leslie Carrara-RudolphAbby Cadabby (voice) | Abby Cadabby (voice) |
 Caroll SpinneyOscar the Grouch (voice) | Oscar the Grouch (voice) |
 Martin P. RobinsonTelly (voice) | Telly (voice) |
 David RudmanCookie Monster (voice) | Cookie Monster (voice) |
 Carmen OsbahrRosita (voice | Rosita (voice |
 Paul RuddMr. Earth | Mr. Earth |
 Eric JacobsonBert (voice) | Bert (voice) |
 Steve WhitmireErnie (voice) | Ernie (voice) |
 Paul McGinnisAdditional Muppets | Additional Muppets |
 Pam ArcieroGrungetta (voice) (archive footage) (uncredited) | Grungetta (voice) (archive footage) (uncredited) |