Guns: The Evolution of Firearms (2013)

S1E14 Underworld

After the peace negotiations between the Speleans and the Caligars collapse, King Randor, Prince Adam, and Man-At-Arms head to Subternia in hopes of facilitating a resolution. Meanwhile, the Evil Warriors plot to assault Castle Grayskull from beneath, having exhausted all other strategies. Before long, the two factions collide in the shadowy depths of Eternia...