I Knew It: The death of Lion-O's mother in childbirth was one of the major fan theories from the very beginning.
Several fans settled on the name "Leona" for the Queen of Thundera before Dan Norton confirmed they crew called her that too.
Almost immediately after Panthro lost his arms fans not only theorized that he would get new cybernetic ones, but it's the Berbils that hook him up with them. Guess what happened in the very next episode.
A few fans actually did guess that Pumyra would betray the Cats a week before it happened.
Mean Character, Nice Actor: Matthew Mercer, voice of Tygra and all around awesome guy, admits that after reading scripts and doing recordings, he sometimes wants to just step back and yell "He's (Tygra) such a dick!"
Network to the Rescue: The show's ratings were okay, but the toys didn't sell as well as hoped so Warner Bros. talked Cartoon Network into moving the show from Friday nights to Saturday mornings as a lead-in to the popular DC Nation programing block. The show's ratings doubled overnight. Unfortunately...
New info from an inside source indicates that the toy line isn't dead, and was a mistake made by Amazon.com which has been corrected. Bandai still seems to be supportive of the line. The rest concerning Cartoon Network is true though.
Toonami has decided to pick up the series as part of it's new expanded block, alongside fellow CN favorite Sym-Bionic Titan, giving them the support and reruns they needed which Cartoon Network itself never provided, though now at a very late time slot. Time will tell if this is enough to get both shows another season.
Unfortunately, both shows have been taken off in favor of Sword Art Online and Season 2 of The Big O. Though Sym-Bionic Titan will return, ThunderCats is suffering the worst of it, as Toonami is losing the rights to the show and won't be able to air it again. We can now only hope if its reruns on Toonami have been successful in garnering a second season.
Though the uncertainty of the show's future could simply be chalked up to the trolling creators, who've been yanking audiences chains from day one, Panthro is dead!
The Other Darrin: Leo is voiced by Will Friedle in his first appearance because of Lion-O reliving events of the past through Leo. "Birth of the Blades" has Jason Marsden voicing him, and this is likely what Leo's actual voice sounds like. This is something of a Casting Gag, since Will and Jason are good friends.
What Could Have Been: A panel discussion at the 2013 Power-Con revealed various tidbits on the planned second season and beyond, including its length (the series was intended to be 65 episodes long), certain character origins (Snarfs are actually impervious to damage, and were an early experiment at creating a genetically superior race that would ultimately result in the Cats, while Slythe joined Mumm-Ra because Lynx-o had destroyed the marsh where the wives and unborn children of Slythe's tribe were waiting), other character tidbits (Pumyra was ultimately going to be turned into an insectoid monster and try to kill Lion-o, while Lynx-o is beheaded by Slythe in revenge for the aforementioned killing of his tribe's women and unborn children, and Slythe himself would pull a Heel-Face Turn to aid Lion-o that would get him killed by Mumm-Ra), and the identity of the last stone Lion-o and his allies were searching for (the Soul Stone).