Warner Bros. Animation’s Boss Is Out Right as the Studio Gets Split in Two

Sam Register, who has run Warner Bros. Animation, Cartoon Network Studios and Hanna-Barbera Studios Europe for 18 years, is departing after the studio and Register “mutually agreed” not to renew his contract, Variety reported in an exclusive Tuesday, August 25 [1]. Register joined Warner Bros. Animation as a producer in 2007, was named its head in 2008, and added oversight of Cartoon Network Studios in 2020, presiding over titles including the “Animaniacs” revival, “Harley Quinn,” “Teen Titans Go!,” Genndy Tartakovsky’s “Primal,” and the live-action/animated “Tom and Jerry” feature [2, 3]. No permanent successor has been named; Matt Matzkin will continue overseeing business operations while creative department heads Jay Bastian, Jason DeMarco, Audrey Diehl, Sarah Fell, Peter Girardi and Sammy Perlmutter split day-to-day creative duties during the search [4]. The exit lands as parent company Warner Bros. Discovery prepares to formally split into two separate companies, “Warner Bros.” and “Discovery Global,” a separation expected to close in 2026 that has already created uncertainty over which entity ultimately controls animation properties tied to both the Cartoon Network/Discovery+ side and the Warner Bros. streaming and studio business [5].

Why It Sucks:

Warner Bros. Animation and Cartoon Network Studios Employees

• The top job sits empty during a shaky moment. Register’s exit leaves no permanent leader in place at three studios simultaneously, right as the wider animation industry is already absorbing thousands of layoffs and studio closures in 2026 [1, 4].
• Six executives now split one job. Business operations and creative decisions are being divided among six different department heads on an interim basis, a structure that can slow greenlights and leave staff unsure who has final say on their projects [4].
• The split adds a second layer of uncertainty. Employees are absorbing a leadership change at the same time their parent company is dividing into “Warner Bros.” and “Discovery Global,” with no public clarity yet on which company their jobs and shows will land under [5].

Fans of Warner’s Legacy Animated Properties

• Stewardship of beloved IP is now unsettled. Register’s 18-year run shaped the direction of Looney Tunes, Scooby-Doo, and the broader Hanna-Barbera catalog, and fans now face a leadership gap with no announced vision for where those properties go next [2, 3].
• The corporate split could scatter the catalog. Because Cartoon Network and Adult Swim properties may end up tied to “Discovery Global” while the studio infrastructure sits under “Warner Bros.,” fans worry favorite shows could become harder to find or get deprioritized entirely [5].
• A search process means more waiting. With no successor named, fans of in-development projects are left waiting to see whether a new hire preserves current creative commitments or resets them entirely [1, 4].

Warner Bros. Discovery Corporate Leadership and Investors

• A messy split just got messier. Losing the executive who has run animation for nearly two decades in the middle of dividing the company into two separate businesses adds one more variable to an already complicated corporate separation [1, 5].
• Interim leadership isn’t a long-term fix. Splitting responsibilities among six department heads may keep production moving in the short term, but it’s not the kind of stable structure investors typically want to see heading into a corporate spinoff [4, 5].
• The timing invites scrutiny. A “mutually agreed” non-renewal announced right before the Warner Bros./Discovery Global separation raises questions about whether animation is being deprioritized in the split, a narrative the company will now have to manage [1, 5].

Sources & Citations:

[1] Variety: Sam Register to Depart as Head of Warner Bros. Animation, Cartoon Network Studios and Hanna-Barbera Studios Europe
[2] Deadline: Sam Register Leaving As Warner Bros. Animation President
[3] The Hollywood Reporter: Longtime Warner Bros. Animation President Sam Register Departing
[4] TheWrap: Longtime Warner Bros. Animation Head Sam Register Is Exiting
[5] Variety: Warner Bros. Discovery Split: What Will Happen to the Movie Studios, HBO Max, Cable Networks and Other Businesses?