The third and final movie in the Lion King trilogy, The Lion King 1½ is based on Rosencrantz and Guildenstern Are Dead, which is essentially a retelling of Hamlet through the eyes of minor characters. The Lion King 1½ is a retelling of the first movie through Timon (Nathan Lane) and Pumbaa's (Ernie Sabella) eyes. It also gives the origins of Timon and his life in a meerkat colony.
It's interesting to see what Timon and Pumbaa were like before they were . . . Timon and Pumbaa. The movie also starts out with one hell of a bop called "Diggah Tunnah," aka dig a tunnel. Whoopi Goldberg, Cheech Marin, and Jim Cummings also return as hyenas Shenzi, Banzai, and Ed for the film. Plus, there are a few cameos from some well-known Disney characters toward the end, as the movie is told in a Mystery Science Theatre 3000-type setting.
The Lion King 1½ is currently available to watch on Disney+.