In “Dolphin Reef,” Disneynature dives under the sea to frolic with some of the planet’s most engaging animals: dolphins. Echo is a young bottlenose dolphin who can’t quite decide if it’s time to grow up and take on new responsibilities-or give in to his silly side and just have fun. Dolphin society is tricky, and the coral reef that Echo and his family call home depends on all of its inhabitants to keep it healthy. But with humpback whales, orcas, sea turtles and cuttlefish seemingly begging for his attention, Echo has a tough time resisting all that the ocean has to offer.

In 2019, Lincoln Six-Echo is a resident of a seemingly “Utopian” but contained facility. Like all of the inhabitants of this carefully-controlled environment, Lincoln hopes to be chosen to go to The Island — reportedly the last uncontaminated location on the planet. But Lincoln soon discovers that everything about his existence is a lie.

Orbiting a quiet backwater planet, the massed forces of the universe’s deadliest species gather, drawn to a mysterious message that echoes out to the stars. And amongst them, the Doctor. Rescuing Clara from a family Christmas dinner, the Time Lord and his best friend must learn what this enigmatic signal means for his own fate and that of the universe.