Craig McCracken made the official announcement about Wander Over Yonder's cancelation on his Tumblr page on March 5th, 2016.
"I’ve been seeing a lot of speculation lately on whether or not Wander will be returning for a 3rd season. Unfortunately, the answer is no.
About a year ago we presented a pitch for a season 3 arc that promised to bring our characters together in new, unexpected, and hilarious ways. And just as S2 evolved from S1, we had a really exciting approach to evolving S3 even further. We had plans for new characters, the return of old characters, and even a bit of backstory! We were all really excited about the new direction and so were our bosses at DisneyXD and TVA.
Unfortunately, the higher up bosses of bosses of bosses at Disney decided not to continue with the show. It’s not that they didn’t like Wander, they just felt that 2 seasons and 80 cartoons was enough and they didn’t see the need to produce any more.
For the record, this decision had nothing to do with the ratings performance of S2. Truth be told, we were informed that we wouldn’t be continuing before S2 even premiered.
I’d like to take this opportunity to thank the fans who spread the word about Wander and encouraged people to try and watch it on air.
I know this news is kind of a bummer, but the recent surge in fandom from My Fair Hatey along with our win at the Annie’s for Outstanding Children’s Series has really made me and the whole Wander team feel that we are ending on a high note!
So thanks, and as Wander says…
We gave it a go,
put on a heck of a show,
and did a lot of fun stuff we’ll get to laugh about after!
And for those keeping track we have 7 half hours left of S2 that will wrap up sometime in June.
Thanks for watchin’ and wanderin’!
Frank Angonez's Response
Frank Angonez made a Tumblr post of FAQ about the news.
"Wanted to take the opportunity to answer some of the most popular questions I’ve been getting over the past two days in one big old post.
Is it true?!
Sad to say, yup. It’s true. Wander Over Yonder will be ending after seven more episodes with a 22-minute finale some time in June.
Take it easy. The theory that seems to hold the most water is that WOY has always done better in repeats than it did in premieres. Like, we’ve had random repeats rate as the best show on the network on some odd weeks. I think that Disney decided that 80 pieces of Wander content (between individual cartoons, 22s, and the shorts) was enough that they could keep repeating them without a noticeable impact and draw the same ratings without spending more on new episodes. And while we have been doing better in premieres this season, this decision was made before Season 2 even premiered.
DOUBLE WHAT?! When did you guys know?
A week after we got nominated for an Emmy, a week before “The Greater Hater” aired, seven months before we won the Annie for Outstanding Children’s programming, eight months before “I’m the Bad Guy” went crazy viral…
Why didn’t you say anything?
Honestly? Because we’re Wander Over Yonder. We thrive on hope. I think somewhere deep down I’ve been hoping Disney would reconsider. And we’re so proud of this season that we wanted people to give it a fighting chance instead of dismissing it as “that show that’s probably gonna end soon.”
And it’s not over yet! Dominator is cutting a flaming, icy swath of destruction across the cosmos and it’s up to Wander, Sylvia, Lord Hater, and Peepers to save the galaxy!
DISNEY IS A MONSTER! I’m gonna go break my Wreck-It Ralph Blu-ray in half!
Don’t do that! That’s a good movie featuring some very charming and handsome voice actors!
Guys, Disney actually made two seasons of this show in the first place. 80 Wander Over Yonderstories. Yes, we had more stories to tell. Yes, we’re bummed. But when all things are said and done, Disney probably spent more on making The Cartoon/The Bot than they did on Snow White and the Seven Dwarves. That’s insane.
I heard you guys had a Season 3 arc in mind, with some backstory and a new status quo. Will you at least tell us what it was about?
NOW YOU ARE THE MONSTERS! Why not?
Because Hey Arnold just got a finale movie fifteen years after it ended. And Samurai Jack is coming back. And Gilmore Girls is returning. And…
For the record, I’m not saying we’ve been given any indication whatsoever that Disney could change their minds. We just like the story too much to blow it on a Tumblr post.
Are you guys still gonna post on Tumblr?
Disney didn’t cancel our internet accounts. Yeah, of course we’ll be around throughout the rest of the season, and we’ve all got a lot of cool stuff going on through the end of the season and beyond.
What can we, the fans, do? Never hurts to help, right?
See, this is why we love you guys.
The best thing you can do is love the show. Watch it, rewatch it (I hear it repeats very well), sketch it, fanfic it, ship it, cosplay it, sing the songs, tell your friends about it, make it a thing even after it’s gone, and never forget it.
Everybody who worked hard on this show did it because we believe in Craig and what he wanted to say with Wander. We believe the darkest of times calls for the sunniest of smiles, a little bit of silliness can save the galaxy, and everyone deserves a friend. Even maniacal electrical skeleton men.
I know things seem rough now, but remember: If the darkness comes a creepin’, and you’re feelin’ down, just Wander Over Yonder and turn your life around..." 
The Rise of SaveWOY
- ↑ http://crackmccraigen.tumblr.com/post/140529754374/wander-over-yonder-over Announcement of Wander Over Yonder's cancelation
- ↑ http://suspendersofdisbelief.tumblr.com/post/140619352161/faq-about-the-wander-over-yonder-announcement Frank's FAQ
- ↑ http://peepsqueak.tumblr.com/post/140542383242/petition-for-woy-season-3 The start of the SaveWOY campaign