The episode is called “Song Of The Petalars,” and it features the highly-anticipated return of Panthro!
Here’s the official description:
On the run from the unstoppable lizard army, Lion-O fears for his life. While hiding, he encounters a race of creatures who live out their entire lifetime in 24 hours, and learns a valuable lesson about hope. Plus, the highly anticipated debut of Panthro and the Thundertank!
And here are the images:
