This episode borrows much from J.R.R.Tolkien's "Lord of the Rings" saga. Although the Superfriends' alternate forms are called "trolls", they resemble hobbits much more. Other references include calling the subterranean realm "Middle Earth" and having Batman and Wonder Woman search for a magic ring to defeat the overlord.
Borrows extensively from the "Lord of the Rings" saga. Most notably in that the realm is called Middle Earth and that the Super Friends have to search for a magic ring. Also, even though the Super Friends are turned into "trolls", their forms look much more like hobbits than trolls.