Lion-O is haunted by the recurring nightmares of Thunderians being killed on Thundera while he fled to the safety of Third Earth with Jaga and the other ThunderCats. Jaga later tells Lion-O that 3 more Thundercats have, in fact, survived and are also living on Third Earth. The ThunderCats decide to search for the 3 new Thunderians, but Mumm-Ra has plans as well and takes the new Thunderians as his prisoners to Fire Rock Mountain. Lion-O loses the Sword of Omens in an avalanche while Panthro battles the Fist-Pounder with the ThunderTank as the ThunderCats close in on rescuing the Thunderians from Fire Rock Mountain, but they'll need supernatural help if they are to pass through the Thundranium gasses to reach them.
Joan Wilder is thrust back into a world of murder, chases, foreign intrigue... and love. This time out she's duped by a duplicitous Arab dignitary who brings her to the Middle East, ostensibly to write a book about his life.
Ever in search of adventure, explorer Allan Quatermain agrees to join the beautiful Jesse Huston on a mission to locate her archaeologist father, who has been abducted for his knowledge of the legendary mines of King Solomon.
Taran is an assistant pigkeeper with boyish dreams of becoming a great warrior. However, he has to put the daydreaming aside when his charge, an oracular pig named Hen Wen, is kidnapped by an evil lord known as the Horned King.