Actor Courtney B. Vance attends the Hasty Pudding Institute of 1770 Honors David Heyman at the Order of the Golden Sphinx Gala at the Appel Room at Jazz at Lincoln Center on March 10, 2014 in New York City

Actor Courtney B. Vance attends the Hasty Pudding Institute of 1770 Honors David Heyman at the Order of the Golden Sphinx Gala at the Appel Room at Jazz at Lincoln Center on March 10, 2014 in New York City

*Showtime‘s “Masters Of Sex” continues to pad its sophomore-season cast.

Courtney B. Vance and Rene Auberjonois have joined the period drama in guest roles.

Vance will recur as Dr. Hendricks, head of an African-American hospital in St. Louis whose goal is to racially integrate his hospital, and Auberjonois will play Dr. Papanikolaou, inventor of the Pap smear.

As previously reported, Keke Palmer will also guest star on Season 2 of “Masters of Sex.” She’ll play William Masters’ nanny, Coral, whom they hire to care for their new baby.

Season 2 of the series starring Michael Sheen and Lizzy Caplan premieres July 13 after the season premiere of “Ray Donovan.”