He explained: “I had all of the Muppets sign a Non-Disclosure Agreement.
“Just to be extra safe, when I went to do Masked Singer I turned off the WiFi, locked the stage door and kept them distracted by giving them a room full of bubble wrap to pop.
“This way they couldn’t tell anyone anything until after the show was over.”
Kermit’s performance as the Snail has certainly set a high benchmark for celebrity guests, so Masked Singer fans won’t want to miss another second of the show’s rollercoaster fifth season.
The Masked Singer season 5 continues Wednesday, March 17 on Fox.