Sammy Davis, Jr. and Lorne Greene lend their voices to this animated musical version of Johanna Spyri's classic family tale about girl who wins the hearts of everyone she meets--Heidi Song. As a young orphan, Heidi (voiced by Margery Gray) goes to live with her grumpy grandfather (voiced by Lorne Greene). But the idyllic life they create together ends abruptly when Heidi's aunt claims custody and then sells Heidi to Mme. Rottenmeir (voiced by Joan Gerber) to serve as a companion to an invalid girl in Rottenmeir's care. Now, in spite of Heidi's ability to befriend all around her, she soon misses her grandfather and longs for their life in the mountains.