Question: The actress and singer Heather Morris is best known for her role in which series, becoming a regular character in the second season?

 The character is portrayed by actress Heather Morris, and first appeared in the show's second episode, "Showmance". Brittany Susan Pierce is a fictional character from the Fox musical comedy-drama series "Glee".  Brittany was developed by "Glee" creators Ryan Murphy, Brad Falchuk, and Ian Brennan.  In "Glee", Brittany is a cheerleader, or "Cheerio" for the fictional William McKinley High School, and a member of the school's glee club led by Will Schuester.  Morris was originally hired to teach Beyoncé's "Single Ladies" dance to the "Glee" cast.  The show at the time was looking for a third cheerleader, and Morris landed the role.  Morris was upgraded to a series regular in the series' second season, in which Brittany is given a larger storyline, solos and dance routines to perform. <SEP> Suzanne "Crazy Eyes" Warren is a fictional character played by Uzo Aduba on the Netflix series "Orange Is the New Black".  Warren is portrayed as intelligent, but lacking in social skills, and prone to spiral into emotional outbursts when agitated.  The character is the only role that has received Emmy Award recognition both in the comedy and drama genres from the same show and only the second character to earn Emmy recognition in both genres.  Aduba won the Emmy Award for Outstanding Guest Actress in a Comedy Series as well as the Critics' Choice Television Award for Best Guest Performer in a Comedy Series for her season one performance.  She received the Emmy Award for Outstanding Supporting Actress in a Drama Series as well as the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Comedy Series for her season two performance.  Her season three performance again won Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Comedy Series.  She is a recurring character in season one and a regular character beginning with season two. <SEP> Heather Elizabeth Morris (born February 1, 1987) is an American actress, dancer, singer and model, known for her role as Brittany S. Pierce in the Fox musical comedy-drama series "Glee". <SEP> Santana Lopez is a fictional character from the Fox musical comedy-drama series "Glee".  The character is portrayed by actress Naya Rivera, and has appeared in "Glee" from its pilot episode, first broadcast on May 19, 2009.  Santana was developed by "Glee" creators Ryan Murphy, Brad Falchuk and Ian Brennan.  Introduced as a minor antagonist and a sidekick to Quinn Fabray (Dianna Agron) in first episode of "Glee", Santana's role grew over the course of the show's first season.  In the second season, Rivera was promoted to series regular, and Santana was given more high-profile storylines, such as the development of her romantic feelings for her best friend Brittany Pierce (Heather Morris), and subsequent realization that she is a lesbian.  Rivera, who has been vocally supportive of the love story between her and Morris' character, has received widespread praise for her portrayal of Santana, as well as for her for vocal work in numerous songs performed as part of the show's central glee club, New Directions.