B Positive

CBS | 9:30 pm

Two-time Tony Award winner Katie Finneran guest stars as Natalie, Gina's (Annaleigh Ashford) sister, who pays her sibling a surprise visit in a new episode called "S'mores, Elvis and a Cubano." Meanwhile, Drew (Thomas Middleditch) starts an extended road trip with Harry (Hector Elizondo), unaware that he and his passenger have two totally different destinations in mind. Kether Donohue, Sara Rue, Linda Lavin, Jane Seymour and Ben Vereen also star.