Adult Swim has just dropped a 15-second Rick and Morty short that has sent fan hype for season four into overdrive.

The super-trippy short sees the pair evolving through various stages, from cells, to fish, to mammals, to Godzilla and Mothra, and concluding as planets, with a black hole-like Rick pulling Morty in. Watch below.

As you can see from the Twitter post above, the caption gives nothing away about season four — it's not even really clear if the short is a teaser for the new season at all. And that has got some Rick and Morty mega-fans a little annoyed. Check out the reactions below.

Why no release date though?

Seriously, where is it?

That's it?

Are you tired of waiting for Rick and Morty season four? Let us know in the comments.

In other news, Netflix has delivered a first look at Marvel's 'The Punisher' season two.