Kaa

Kaa was a character from the Disney film The Jungle Book. He was a snake who was encountered by Mowgli. The Fourth Doctor relayed this information to an unseen audience before a clip from the film played. (NOTVALID: Disney Time 1975)

Behind the scenes
Kaa's signature song in the Disney movie, Trust in Me, was mentioned in the novel EarthWorld; Anji Kapoor quotes the line "trust in me, just in me". The song is never attributed to Kaa within the narrative.