Sigourney Weaver as the voice of the Marine Life Institute in, Disney's got a whale of a tale for you: National Geographic's four-part docuseries, which is narrated by Weaver and coming soon to Disney+. ET is exclusively debuting a new clip.«With her calm and confident voice, Sigourney brings both passion and gravitas to the series' narration,» National Geographic Explorer and photographer Brian Skerry tells ET.