"Labor Day" is the thirty-second episode of the fourth season of Teen Titans Go!, and the one-hundred-eighty-ninth overall episode of the series.
Robin uses Labor Day as an opportunity to teach the other Titans about the importance of labor.
The four Titans except Robin are sitting on the couch relaxing, when Robin announces that it is the first Monday of September, which means...Labor Day! The concept excites the four of them, causing them to leap into their dances; they'll be getting a three day weekend and a day-off!
However, Robin just has to be the typical killjoy by reminding them that Labor Day is for appreciating labor by rolling the word off his tongue figuratively, and then furiously scolds Beast Boy for misinterpreting "hard work" as "baby delivery of pregnant moms". He uses his shirt as an example, telling the four others that producing it involves cotton-planting farms, fabric and dyeing industries, as well as seamstresses and tailors and store owners, just for putting it on the rack, though he refuses to answer Starfire's question on where his shirt is being bought by emphasizing the hundreds of workers who have made it only through his shrilling shout. Raven just has to complain that his shirt being ugly anyway, much to his fury. As for Cyborg, he digresses by suggesting going on a beach for a holiday, which he, Beast Boy and the girls are looking forward to.
Later, the Titans decide to hit the road. Starfire anticipates on swimming with the peanut butter and the jellyfishes. As for Robin, he wants to ensure that they have everything equipped for a day in the sun so as to protect themselves from the radiation. They've gotten themselves sunglasses and sunscreen, except that...the beach umbrella. As the car stops, looks like Beast Boy has casually confirmed his carelessness. The girls believe that they are all going to be fried in the sun, but Robin comes up with a plan when Cyborg just panics...to make one with their own hands! Beast Boy and Raven believe that he's being nuts, though Robin thinks that as the appropriate way to celebrate the holiday, and such explanation persuades his four friends relatively quickly. With Cyborg to cut and sculpt the wood, Raven to create the screws and hinges, Starfire to glue the pal fronds and Beast Boy to slurp tree sap for gluing, they manage to create their very own umbrella! All five of them are proud of themselves, and Starfire even affirms their pride by insulting the sun.