The new SHOWTIME comedy BLACK MONDAY is adding to its guest star lineup with Emmy® and two-time Oscar® nominee Bruce Dern (Big Love), Melissa Rauch (The Big Bang Theory) and Horatio Sanz (Saturday Night Live, Glow) signing on, along with Julie Hagerty (Airplane, Instant Family), Vanessa Bell Calloway (SHAMELESS, Saints & Sinners), Tim Russ (iCarly) and Jason Michael Snow (Book of Mormon).