ThunderCats #5, p. 10

Grune the Destoryer calling out Lion-O, Lord of the ThunderCats while before his fellow ThunderCats.

Grune: Har! Prove it, Whelp!
Meet me at the Crystal Canyon at sunrise, and we'll settle this with an old-fashioned duel. The rightful king of Thundera will have no problem defeating the pretender of the throne.
See you at DAWN, cub.
KRR-BAAM!

Cheetara: You AREN"T going to go, are you?
Lion-O: Of COURSE I'm going to go. I HAVE to go.