Main •
Breckin Meyer as Elmo "Jared" Franklin, Duke of Landingshire, the snarky, self-confident party-boy son of a famous trial lawyer. •
Mark-Paul Gosselaar as Peter Bash, Franklin's best friend and legal partner, who is slightly more mature and level-headed than Franklin. •
Malcolm McDowell as Stanton Infeld, who is eccentric and yet easy-going. Stanton is a senior partner in the prominent law firm Infeld-Daniels. After witnessing their unconventional techniques in court, he hires Franklin and Bash due to their resemblance to him and a partner back in his early days of his law firm. •
Reed Diamond as Damien Karp, Stanton's staid but conniving nephew, former senior partner for Infeld Daniels, who is resentful of Franklin and Bash's good standing and quick success with his uncle. •
Dana Davis as Carmen Phillips (seasons 1–3), •
Garcelle Beauvais as Hanna Linden (seasons 1–2), a senior partner working for Infeld Daniels, and Karp's ex-girlfriend who uses Franklin's affections to get back at Damien. •
Heather Locklear as Rachel Rose King (season 3), a trial lawyer who joins the firm as a newly named on-door law partner, causing it to be renamed Infeld•Daniels•King LLC. •
Toni Trucks as Anita Haskins (season 4), a smart, professional law school graduate who joins the firm for a chance to actually try cases as opposed to doing research.
Recurring •
Claire Coffee as Janie Ross (seasons 1–2), an Assistant DA and Peter Bash's ex-girlfriend •
Beau Bridges as Elmo "Leonard" Franklin (seasons 1–2), Jared Franklin's father. Their family passes the name Elmo from father to son, though they adopt other names for everyday use. •
Alexandra Holden as Debbie Wilcox (season 1), an assistant to Franklin and Bash. Her absence from the series midway through season 1 onward is never explained. •
Rhea Seehorn as Ellen Swatello (seasons 1, 3–4), an assistant DA who is overshadowed by Janie Ross and dislikes Franklin & Bash. •
Kathy Najimy as
Judge Alice Sturgess (season 1), who is no fan of the titular attorneys and has cited them for
contempt of court. •
Gates McFadden as Judge Mallory Jacobs (season 1–4), a judge who dislikes the duo's antics •
Kat Foster as Wendy Cowell (seasons 2, 4), an LAPD officer who dated Bash •
Robert Wuhl as Judge Maxwell Nulis (season 2–4), a judge who admires the duo •
Nicky Whelan as "Charlie" Charlotte (season 3), beach house neighbor, kinesiologist and love interest for Bash •
Jane Seymour (season 2–4) as Colleen Bash, a sex surrogate and Peter Bash's mother •
Yuji Nagata (season 3) as himself, boyfriend of Colleen Bash ==Development and production==