Question: Were both Escape to Witch Mountain and The Muppets films adapted from science fiction novels written by Alexander H. Key?
Sentence (from "The Muppets (film)"): In "The Muppets", devoted fan Walter, his brother Gary, and Gary's girlfriend Mary help Kermit the Frog reunite the disbanded Muppets, as they must raise $10 million to save the Muppet Theater from Tex Richman, a businessman who plans to demolish the studio to drill for oil.
Relevant evidence: Yes