Walter is a humanoid Muppet character introduced in the 2011 film The Muppets. He is sweet, slightly naive, lacking self-confidence, and, like his human brother Gary, is a huge fan of the Muppets, who are the only people he has ever seen who are just like him. In the film, Walter and Gary set out to reunite the Muppets to help save Muppet Studios. Eventually, by the end of the film, Walter is officially accepted as the Muppets' newest member.
As Walter is a fairly new addition to the Muppet cast, he made his first appearance in a Christmas special in Lady Gaga & the Muppets' Holiday Spectacular. However, despite it being his first time appearing in a Christmas special, he does not have a very big role outside of dancing to Lady Gaga's songs alongside his fellow Muppets. He only has one line of dialogue in the special, in which he makes a suggestion for the show's finale.
Oddly, Walter is nowhere to be seen in the Muppets' most recent Christmas production, "Single All the Way".