Sneak Peek: Muppets Invade 'Good Luck Charlie'

What better way to cheer up an upset family and give them a little encouragement than some heartening tunes from The Muppets? ET has your sneak peek at the season premiere of Good Luck Charlie and an exclusive behind-the-scenes photo.
The Duncans have been distraught on Good Luck Charlie ever since their house was destroyed by termites at the end of Season 3. As their worries about where they'll live continue to escalate, the family is paid a special visit from The Muppets to help cheer them up.
As we see in the sneak peek, "Teddy Duncan" (Bridgit Mendler) is upset as she sits in her home observing all the damage, but becomes inspired to renovate the house with a little help from "Kermit the Frog."
Kermit, who is later joined by other members of the Muppets crew, expresses his encouragement in the form of a musical number.
However, Kermit's inspirational message to Teddy is thwarted by his wife, "Miss Piggy," and Teddy's mother, "Amy" (Leigh-Allyn Baker), who would prefer an extravagant dream house instead of renovating their existing run-down house.
"It's my very first time working with The Muppets and it's an absolute dream. All of them are fantastic," Mendler said.
Watch the video above for a full preview and check out The Muppets on the Season 4 premiere of Good Luck Charlie this Sunday at 7:30 p.m. on the Disney Channel.