Thundera is attacked by lizards who have acquired salvaged ancient technology. In face of betrayals, revelations and tragedies, Lion-O and Tygra mount a rescue with the team.
After escaping their destroyed city, the team encounters the Fishmen. The ThunderCats' quest is to find the Book of Omens ... but Lion-O is more interested in revenge.
While hiding from the unstoppable lizard army, Lion-O encounters a race of creatures who live out their entire lifetime in 24 hours, and learns a valuable lesson about hope.
Panthro finally joins the team, but his gruff demeanor intimidates Lion-O. Despite his best efforts, Panthro can't dissuade the Cats from following him on a mission to get Thundrillium to fuel the Thundertank.
Lion-O ventures into the Book of Omens where he becomes the incarnation of his renowned ancestor, the valiant Leo, who led the rebellion against Mumm-Ra in a previous millennium.
While traveling, Lion-O's cockiness loses him the Sword of Omens to the Duelist, a villainous sword-collector. With the help of the listless Drifter, Lion-O must get it back.
The Cats track the first stone's location to the mystical Elephant Village, but the forgetful Elephants can't remember where it is.Lion-O must learn to use Sight Beyond Sight.
Sent by the Elephants to the Forest of Magi Oar, Lion-O must learn to master Sight Beyond Sight before returning to the Elephant Village. The Cats encounter a group of paper warriors with a dark secret.
The Cats are ready to retrieve the stone from the "Astral Plane" in the Elephant Village, but find it overtaken by Grunea and Mumm-Ra's forces. Plus, Tygra and Cheetara's early relationship to one another is revealed.
Tygra and Lion-O enter the Astral Plane to retrieve the stone, but encounter Mumm-Ra in the process. Grune and Panthro have their final duel. Cheetara finally chooses her beau.
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What is the French language plot outline for Thundercats (2011)?