The character of King Grayskull is based on an early prototype of He-Man for the 2002 line designed by the Four Horsemen which featured him with longer hair. The producers liked the character design so much that they decided to incorporate him into the series.
First appearances of King Grayskull, Queen Veena, Grizzlor, Leech, Mantenna, Calix, and Oracle.
In the script the original plan was to see the actual battle between the Snake Men and Hordak's forces. However for production reason, it was conveyed through a painting.
This is the first time the origin of Castle Grayskull is displayed. As well as the explanation for the abyss surrounding the castle.
An action figure of King Grayskull was released as one of the first figures in the Masters of the Universe Classica line in 2008 as a San Diego Comic Con exclusive and was also available in a limited bronze 'statue' variant. Two more variants followed: a redesigned version in 2010 and a glow in the dark Spirit of King Grayskull in 2015.