There's yet another change at the top of a freshman show.

CBS' Michael Weatherly starrer Bull is changing showrunners in advance of an expected second-season renewal, The Hollywood Reporter has confirmed.

Moonlighting and Medium creator Glenn Gordon Caron has signed an overall deal with producers CBS Television Studios and will take over as showrunner for Mark Goffman, who will exit at season's end to focus on development under his own existing deal with the studio. Caron's deal with the studio is a two-year pact. 

Caron will join the series to get the lay of the land from Goffman as he wraps up its freshman run before taking the seat at the head of the table for season two. Goffman joined Bull after the pilot was picked up to series.

The drama, loosely based on the life of Dr. Phil McGraw, ranks as the No. 1 new freshman series and No. 3 scripted series overall among total viewers. It's considered a lock for a renewal, especially given that it is produced in-house by CBSTVS.

Caron, repped by WME, 3 Arts and Ziffren Brittenham, joins CBSTVS from 20th Television, where he was an executive producer on Howard Gordon's Tyrant.

Bull becomes the latest freshman series to change showrunners. It joins ABC's Designated Survivor and Fox's Star (both now on their third showrunner); NBC's DC Comics comedy Powerless; Fox's live-action/animated hybrid comedy Son of Zorn; and CBS' Kevin James comedy Kevin Can Wait.