On March 4, 2019, it was announced in a press release that Action would be replaced by a full-time Adult Swim channel. This marks the first time that the Adult Swim brand has been used for a 24-hour channel. The channel launched with a two-month free preview on linear television beginning April 1, 2019, a high-profile day for the U.S. network due to their annual April Fools' Day scheduling, on-air pranks, and premieres.