When Saoirse and Ben's mother mysteriously disappears into the ocean, the two children go on an epic journey to find out the truth about her, and in the process, discover mystical secrets about both their mother and Saoirse herself. The film takes inspiration from the mythological Selkies of Irish folklore, who live as seals in the sea but become humans on land.

Animated feature film. Originally released as a motion picture in 2014. Bonus materials: Audio commentary with director Tomm Moore; Behind the scenes; Animation test with optional commentary; The art of Song of the Sea; Conceptual trailer; U.S. trailers.