Molly and Rover

Molly and Rover (voiced by Kristin Chenoweth as Molly, and Andy Beall as Rover) are Snoopy's brother and sister. They appear in the TV special, Snoopy's Reunion. They apparently exist in the universe of the Peanuts comic strip, as shown when Snoopy's father receives a letter from all his children and mentions that all eight of them have signed it. However, unlike the rest of Snoopy's siblings, they never appeared and were never named in the strip. They most likely would have appeared if Schulz had been able to keep writing the Peanuts comic strip longer.