ThunderCats (comics) entered the Book of Omens to begin his training and claim his rightful place as Lord of the ThunderCats, but Mumm-Ra uses a powerful spell to keep Lion-O trapped in the book for several years in real time, not "Book" time, and seizes control of Thundera afterwards. In the follow-up mini-series, "The Return" (written by Gilmore and illustrated by Benes, Pimental and Lea), published in 2003, Lion-O returned to Thundera to find it enslaved to Mumm-Ra. Several of the ThunderCats are scattered. Panthro, who was left in charge while Lion-O was away, was forced into slave labor. Tygra and Cheetara
He-Man/ThunderCats shield it from attack when Jaga's spirit form arrives. Jaga tells the Sorceress that he believes there is a way to stop the Spirits but the answer lies on the Thundercat's destroyed home world of Thundara. The Sorceress opens a portal in space and time for Jaga and her to slip through and get the item they need. Outside, despite the hero's best efforts, the Spirits close in on Castle Grayskull. When Man-At-Arms, Tygra, and Panthro fire the cannon at one of the Spirit's head it simply laughs off the attempt and turns to attack the castle. Tygra then uses