The second season of the Adult Swim series Common Side Effects will premiere on Sunday, January 24 at 11:00 p.m. Eastern Time, with the episode released the following day on HBO Max. Co-creators Joe Bennett and Steve Hely confirmed the date during a panel at New York Comic Con 2026. Bennett, who previously saw his series Scavengers Reign canceled by HBO Max before being transferred to Netflix and left unresolved, described the renewal as a relief. The show, which blends trippy animation with a narrative about a fungus expert who discovers a potentially curative mushroom, returns with a new antagonist named Thomas, voiced by Bob Stephenson. Thomas, introduced in the season 2 premiere, pursues the mushroom with a religious fervor, driven by personal history with the substance. Bennett emphasized efforts to give the character depth, allowing viewers to understand his motivations despite his antagonistic role. The series will continue exploring themes of shared hallucinations among users of the Blue Angel mushroom, described as a narrative thread that intersects with the characters' reality. Animation in season 2 expands to more locations and complex action sequences, with increased production capacity for in-house work and higher shot counts. The creators noted that the pharmaceutical industry's ethical dilemmas, introduced in season 1, will be further examined, particularly regarding the challenges of distributing a powerful substance responsibly. Mike Judge, who voices a pharmaceutical executive in the series, remains involved as an executive producer. Bennett also addressed ongoing uncertainty about a potential second season for Scavengers Reign, citing its dedicated fan base but no confirmed plans. Additionally, Bennett discussed an upcoming Netflix series titled Dealies, a character-driven comedy set in a big-box store environment, reflecting his focus on observational humor and contrasts between commercial spaces. When asked about the total number of seasons for Common Side Effects, Hely indicated an ambition to develop 40 to 100 seasons, framing the series as an evolving narrative with the potential for long-term storytelling.