Smiling Friends is an adult animated sitcom created by Zach Hadel and Michael Cusack for Cartoon Network's nighttime programming block Adult Swim. The show revolves around the surreal misadventures of a small charity and its four employees dedicated to spreading happiness. It utilizes a wide variety of different art styles and animation techniques, including stylized traditional animation, computer animation, rotoscoping, stop motion, Flash animation, and live-action. The pilot episode aired April 1, 2020, unannounced as part of Adult Swim's annual April Fools' Day event alongside the premiere of Cusack's other series, YOLO. On May 19, 2021, Adult Swim ordered a full season that was initially set to premiere in late 2021. A panel dedicated to the series was held during the Adult Swim Festival on November 12, 2021, where co-creator Zach Hadel mentioned the show would premiere "within a few months", pushing the release schedule ahead to 2022. The first season contains nine episodes, including the pilot and an 11-minute special. The first season eventually premiered on January 10, 2022, with Adult Swim airing all episodes of the season, except for the special, in one night despite initial plans for a weekly release. Smiling Friends received positive reviews from critics. It was renewed for a second season on February 9, 2022. The season premiere aired on April 1, 2024, with the rest of the season beginning to air on May 13. On June 13, 2024, Adult Swim renewed the series for a third season. The third season was previewed at Annecy on June 11, 2025. On the same day, it was announced the series was renewed for an additional fourth and fifth season. The third season premiered on October 5, 2025. Despite being renewed for two more seasons, in February 2026, Hadel and Cusack announced in a video that the series would end after its third season. They attributed the series' abrupt conclusion to burnout, a shared belief that the show had run its natural course, and expressed concern that if they continued creating episodes that there would be a drop in quality. Despite this, they did not entirely rule out the possibility of the series returning for a special or another season in the future. The final two episodes of the third season were released on April 12, 2026.