Melissa McCarthy, Brian Baumgartner Melissa McCarthy, Brian Baumgartner

It's a new season and a new start for Molly when Mike & Molly returns for its fourth season.

On Monday's premiere (9/8c, CBS), Molly (Melissa McCarthy) finally drums up the courage to quit her teaching job (wait 'til you see how) and finds herself at a career crossroads.

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"I didn't become a teacher because it was my passion," she tells Joyce ( Swoosie Kurtz) and Victoria (Katy Mixon) in the exclusive sneak peek below. "I did it because it was safe and I was too scared to go after my real dream."So what is her real dream? Watch the video to find out.Season 4 of Mike & Molly premieres Monday at 9/8c on CBS.(Full disclosure: is owned by CBS.)