Clarence's Universe

"Clarence's Universe" is the third episode of the fourth season of the American animated television series Clarence. It is a 22-minute-long crossover with Steven Universe, and is written by Tony Infante and directed by Spencer Rothbell. It airs in the United States on September 30, 2019, on Cartoon Network.

In the episode, Clarence, Jeff, Sumo, Chad, Mary, and Amy stay with the Crystal Gems after their car had run out of gas outside Beach City.

Six cast members of Steven Universe voice their characters in the episode. The episode also indicates that the episode takes place after the events of the Steven Universe episodes "Mr. Greg", whereas Steven mentions his father's riches, and before the events of "Crack the Whip", as Amethyst hadn't been defeated by Jasper and regenerated to her current form.

The episode even returns Amy Gillis to the series, but her voice actress Ava Acres is replaced by Ariel Winter, to show she is going through puberty.

Plot
Chad and the family pack to go to a resort and spa at Kingsville, Texas. Sumo, Jeff, and Amy (who had moved back as she missed Clarence) later tag along with the trip as they had gotten their parents' permission. The gang pulls over, having to find the car out of fuel, after Chad had not stopping at a gas station and stopped for the night. They find themselves outside a town called Beach City. As they enter the Big Donut, they meet Greg Universe.

Greg later brings them to the beach house, where they meet the Crystal Gems. Steven shows Clarence his mother's room and shares his information about the Gems. Sadie brings Amy to her home and introduces her to music. As time passes, Clarence and Steven become best friends later on. With Jeff, he gets information from Garnet about their history for "personal reasons". As with Sumo, Amethyst takes him on a mission. Both Chad and Greg return back with a gas canister for the car, having to find the engine killed after all that driving.

Meanwhile with Sadie, she gets Amy to sing "Haven't You Noticed (I'm A Star)", and right off the bat she recognized the lyrics and had a better sing voice than her. Sadie became jealous. Pearl and Mary return from seeing a matinee, but Mary was less than pleased. Amethyst and Sumo return from their mission, and Sumo brings back a living Centipeetle, but it gets loose around the town after showing Clarence and Jeff. Fortunately, they catch it in time and destroy it.

Unfortunately, the Centipeetle had destroyed half the town, leading them to return to Aberdale. Sadie gives Amy her CD as to remember her. After Steven and Clarence say their goodbyes, he gives him his mother's portrait with his face drawn on it. Steven becomes angered at what he did to it, which ends their friendship. He later apologizes to Clarence for his outburst, but he doesn't except his apology. They later sit at the beach and talk about their differences. After their conversation, they respect their opinions and agree to remember each other. After returning home, Jeff had gotten a B- on his report, and Clarence pretends that he is still mad and over Steven, but secretly misses him.

Announcement and promotion
The crossover will be announced on December 2018, at San Diego Comic-Con along with the revival. A sneak peek shows a scene of the Wendles, Jeff, Sumo, and Amy walking in Beach City, followed by going into the Big Donut.