Trials of Lion-O part 2 was written by Will Friedle, who voices Lion-O. It's good for the actor to get inside the head of his character. Lion-O was passing most of 'the trials until he to Tygra's realm and that's where it all fell apart there. It seems that he has a problem with Tygra more than Mumm-Ra. His rescuing the other Thundercats, regaining the Sword of Omens, and battling Mumm-Ra was his biggest moment.
Tygra has always been critical of Lion-O after all these years and now it's biting back at him as he now sees what it's like to be king, even for a brief moment. Lion-O's words about doing whatever he wants as king in the first part is coming through to Tygra. I hope they address this in the next episode.
Wilykit's unwavering belief in Lion-O is a good character development for her and Lion-O acknowledged her contributions for her trails she left for him. Slithe is working well with the new generals than he ever did with Grune. Speaking of Mumm-Ra, he's going to have win me over more to be a serious threat to the Thundercats. I suspect we won't be seeing Mumm-Ra, Slithe, and the new generals after this episode for awhile. Overall, a good episode.