Dan Harmon has said that the season may possibly have 14 episodes, the number that season 3 was intended to have, before it was shortened to 10 episodes. Ryan Ridley suggested in an interview that late 2019 is the earliest possible release date for the season.
On March 16, 2018, Dan Harmon confirmed that the show has not yet been renewed for a fourth season and the future of the series is up in the air.
On May 10, 2018, Dan Harmon confirmed that Rick and Morty was renewed for a total of 70 more episodes, meaning there will be a fourth season, and most likely many more afterwards.
The official [adult swim] Twitter account indirectly confirmed on December 31, 2018 that the season will premiere sometime in 2019. It was later confirmed at the WarnerMedia upfront that the season will premiere in November of that year.
On July 19, 2019, at San Diego Comic-Con, Roiland revealed that the team had already begun work on season five. Roiland and Harmon also revealed that there might be a time-travel storyline, as well as the return of Mr. Meeseeks.
On September 21, 2019, Jeff Loveness revealed he wrote 5 episodes (4x1, 4x6, 4x7, 4x8, 5x1) on twitter.  Ryan Elder responding to say "Those episodes are all really really good". Erica Hayes, a storyboard artist who worked on many episodes, responded saying "Jeff!! You rock! You will be missed!!!", suggesting that these are the only episodes that Jeff will be writing for.On September 23, 2019, Mike Mendel (producer) passed away due to natural causes.
- “My friend, partner, and line producer Mike Mendel passed away. I am devastated. My heart breaks for his family. I don’t know what I’m going to do without you by my side Mike. I’m destroyed.”
- —Justin Roiland on Twitter
- Rick Sanchez (Justin Roiland) A genius scientist and alcoholic whose inventions and experiments serve as the basis for the episodes.
- Morty Smith (Justin Roiland) Rick's impressionable grandson who is often dragged along on his grandfather's escapades.
- Jerry Smith (Chris Parnell) Morty's insecure father, whose disapproval of Rick's influence on Morty only deepens his marital troubles with Beth.
- Summer Smith (Spencer Grammer) Morty's angst-ridden older sister who occasionally joins Rick on his adventures.
- Beth Smith (Sarah Chalke) Morty's holier-than-thou mother, a cardiac surgeon for horses.
Characters of the Day
These are the characters present in one episode within the fourth season.
- Kirkland Meeseeks
- Hologram Rick
- Shrimp Rick
- Shrimp Morty
- Teddy Rick
- Wasp Rick
- Tony's Wife
- Angie Flint
- Miles Knightly
- Mr. Poopybutthole
- Elon Tusk
- Talking Cat
- Abrodolph Lincoler
- Evil Morty
- Story Lord
- Jesus Christ
- Morty's Girlfriend
- Dr. Wong
- Clone Beth
- Jane Becker
- Caitie Delaney
- Anne Lane
- Jeff Loveness
- Albro Lundy
- Mike McMahan
- James Siciliano
- Michael Waldron
- Anthony Chun
- Jacob Hair
- Erica Hayes
- Kyounghee Lim
- Bryan Newton
|1||32||"Edge of Tomorty: Rick Die Rickpeat"||November 10, 2019||2.33|
|Morty get a special crystal that allows him to see how he dies and works to get the ending he wants. Meanwhile, Rick keeps waking up in different dimensions and tries to get home.|
|2||33||"The Old Man and the Seat"||November 17, 2019||1.67|
|Rick discovers that someone used his personal toilet. At the same time, Jerry helps makes an app that becomes a little too influential.|
|3||34||"One Crew Over the Crewcoo's Morty"||November 24, 2019||1.61|
|Rick creates a robot based on heist movies which then goes on to try and heist the universe.|
|4||35||"Claw and Hoarder: Special Ricktim's Morty"||December 8, 2019||1.63|
|Rick gets Morty a pet dragon, but gets closer to it then expected, and Jerry meets a talking cat with some questionable advice.|
|5||36||"Rattlestar Ricklactica"||December 15, 2019||1.32|
|Morty kills a space snake and tries to fix his mistake, meanwhile, Jerry is stuck floating and is on a ticking clock before he falls.|
|6||37||"Never Ricking Morty"||May 3, 2020||1.55|
|An anthology episode with Rick and Morty trying to get off a mysterious train where everyone wants to tell stories about Rick.|
|7||38||"Promortyus"||May 10, 2020||1.34|
|Rick, Morty and Summer visit a planet with face sucking parasites.|
|8||39||"The Vat of Acid Episode"||May 17, 2020||1.26|
|After Morty ruins Rick's plan involving a fake acid vat, Rick gets back at him by giving him a point save device.|
|9||40||"Childrick of Mort"||May 24, 2020||1.22|
|The Smith family vacation takes a sharp turn when they visit a planet Rick thinks he impregnated. Rick and Beth help raise the planet's children while Jerry teaches a tribe of them how to camp.|
|10||41||"Star Mort Rickturn of the Jerri"||May 31, 2020||1.30|
|An adventure with an invisibility belt, but a family that disappears together, must stay together.|
New Rick and Morty phone wallpapers by independent artists from April 20th to the 24th.
- This is the first season to have the Rick and Morty Companion Podcast.