Original Airdate: ?/?/1985
Adora has gone into Thaymor to get some information from a rebel spy, leaving Bow, Kowl, and Spragg and Sprocker behind at the rebel camp. A troll arrives at the camp, and its appearance causes them to go into defensive mode, prompting them to do battle with it. Adora soon returns and uses words instead of fists to find out why the troll has come to see them. The troll is named Grox, and he has come to deliver a message to Adora from King Ahgo.
The King requests an audience with She-Ra immediately concerning a matter of great importance, and Adora promises that she will make sure that She-Ra gets the message. Adora is ashamed of the behavior of the others, who engaged Grox in battle without even asking him what he needed. To give them a lesson in manners, she orders Bow, Kowl, and Spragg to go along with She-Ra in her visit to Spikeheart. When they arrive, King Ahgo tells She-Ra of a strange dream that he had experienced, and the ominous portent that it presents.
The dream showed a machine pulling back a rock, which covered a great mound. Behind that rock laid a door, and on that door was the symbol of the Spider of Crystal. He tells She-Ra that centuries ago, the Spider of Crystal arrived on Etheria with a penchant for nothing save destruction. The trolls of Spikeheart were able to imprison the spider, but that he fears that its slumber is soon to be disturbed. She-Ra and the others agree to go to the mound, which lies in the shadow kingdom of Skullpath, which is the kingdom of the Horde governor Duke Drear. King Ahgo orders that Grox join them on their journey, even though Grox does not desire to travel with a group of troll-haters. The King persists, believing that if nothing else, Grox's presence will demonstrate that not all trolls should be feared.
As they all arrive at Skullpath, Duke Drear watches their every move, and decides to use bone-bats to capture the intruders. Grox saves the lives of Bow, Kowl, and Spragg, forcing them to rethink their prejudices, but in the process, Grox is captured. The others want to go to Drear's fortress and save Grox, while She-Ra moves ahead with Swift Wind to stop the Horde from freeing the Spider of Crystal. At Drear's fortress, Kowl steals Duke Drear's magic wand, and Bow traps him behind a door. The three of them all go to free Grox.
They apologize to Grox for mistrusting him, and ask him for his friendship. Meanwhile, Shadow Weaver and Scorpia arrive at the Spider of Crystal, and Shadow Weaver uses her magic to animate it. It proceeds forward on its rampage, encasing a nearby village in crystal. King Ahgo arrives to help She-Ra, as do the others. They are able to lure the Spider of Crystal into a vale as a means of springing their trap, as She-Ra blocks the exit. King Ahgo uses his magic to enclose the spider beneath a dome of rocks, and it slumbers once more. The humans and the trolls make peace having overcoming their prejudices and earning each other's friendship.
Synopsis by Michael Cravens