"Welcome to the Hellmouth" is the series premiere of the supernatural drama television series "Buffy the Vampire Slayer".
 This episode and "The Harvest" were originally aired as a two-part series premiere on The WB on March 10, 1997.
 The episode was written by the series creator and executive producer Joss Whedon, and directed by Charles Martin Smith.
 "Welcome to the Hellmouth" received a Nielsen rating of 3.4 upon its original airing and received largely positive reviews from critics.
Motive is a Canadian police procedural drama television series that aired for four seasons on CTV from February 3, 2013, to August 30, 2016.
 The series premiere had 1.23 million viewers, making it the number one Canadian series premiere of the 2012–13 season.
Kathryn "Kat" Cressida (born March 1, 1968) is an American voice actress.
 She guest-starred in several television shows and was featured in a few films before moving into voice-over full-time in 2000.
 She is notable as a top celebrity voice matcher, impersonating top female stars for Disney Channel, DreamWorks, and gaming companies, among others.
 She is noted for being the first woman to do live announcing for ESPN's coverage of the 2010 NFL Draft, as well as announcing for several other shows for ESPN, NBC Sports, and Versus.
 She is famous as the voice of Dee Dee in season 2 and 4 of the Cartoon Network program "Dexter's Laboratory", Uta in the F/X animated series "Archer", Jayna of the Wonder Twins in a Cartoon Network eyecatch to differentiate "fact and fantasy" in the late 1990s and early 2000s, as well as for voicing the first new character added to Disneyland and Disney World's The Haunted Mansion since its inception in 1969, as Constance, the Black Widow Bride.
 She can also be heard in other attractions throughout the Disney Parks, including Twilight Zone Tower of Terror and Epcot "Character Spot".
 She has been featured as a lead and featured voice for several game titles, notably several LucasArts games, "EverQuest", "Titan Quest", "Dragon Age", and "World of Warcraft", among others.
Henning Christoph August von Anstetten is a fictional character from German soap opera "Verbotene Liebe (Forbidden Love)".
 The character was first played by Markus Hoffmann from the series premiere on January 2, 1995 to January 24, 1996.
 The character was recast two years later after Hoffmann committed suicide a year earlier.
 Actor Hendirk Martz played Henning from 1998 to April 5, 2000.
 The role was once again recast with actor Patrik Fichte, who premiered on-screen on April 7, 2000 and played the role to the character's death on November 13, 2002.
Allí abajo (English: "Down there") is a Spanish television comedy series produced by Plano a Plano for Antena 3.
 Although it is compared to successful film "Ocho apellidos vascos", creators César Benítez and Aitor Gabilondo claim they had on their minds the concept of the show long before the movie, and that it has more in common with French film "Bienvenue chez les Ch'tis".
 It premiered to more than 6 million viewers on a simulcast airing on Antena 3, Neox and Nova, becoming the most-watched series premiere of a Spanish television show since "Aída" in 2005 and the best series premiere for an Antena 3 show since "Compuesta y sin novio" in 1994.
Archer is an American adult animated spy sitcom created by Adam Reed for the FX network.
 The series focuses on the life and exploits of Sterling Archer, the self-proclaimed '"world's greatest secret agent."
 The first four seasons focus on him working for the fictional spy agency ISIS, under his mother, Malory.
 Since then, they have become drug dealers, arms dealers, CIA agents, private investigators and most recently, post-World War II detectives with the first episode taking place in 1947.
 The series premiered on September 17, 2009.
 On June 21, 2016, FX renewed the series for an eighth, ninth, and tenth season, each to consist of eight episodes.
 The eighth season premiered on April 5, 2017, with the series moving to sister network FXX.
John Ross "J. R." Ewing Jr. is a fictional character in the U.S. television series "Dallas" (1978–91) and its spin-offs, including the revived "Dallas" series (2012–14).
 The character was portrayed by Larry Hagman from the series premiere in 1978 until his death in late 2012, and Hagman was the only actor who appeared in all 357 episodes of the original series.
 As the show's most famous character, J. R. has been central to many of the series' biggest storylines.
 He is depicted as a covetous, egocentric, manipulative and amoral oil baron with psychopathic tendencies, who is constantly plotting subterfuges to plunder his foes' wealth.
"The Borgias" is a historical drama created by Neil Jordan based upon the life of Rodrigo Borgia, later Pope Alexander VI, and his family.
 The series takes place in Rome at the end of the 15th century and depicts Borgia's ruthless efforts to win the papal election, his eventual rise to the position of Pope and his family's struggle to maintain and increase their political power.
 The series premiered on Showtime on April 3, 2011, with the Canadian premiere happening one hour later on Bravo!
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 The two-hour premiere was the most-watched original Canadian series premiere on Bravo!
 and the fourth-most-watched-overall program in the channel's history with 575,000 viewers.
 On June 5, 2013, after three seasons, Showtime officially cancelled "The Borgias".
 The last episode aired on June 16, 2013.
Kathleen "Kat" Moon (also Slater) is a fictional character from the BBC soap opera "EastEnders", played by Jessie Wallace.
 She was also played by Kate Peck in a flashback in 2001.
 Kat is the daughter of Viv Slater and Charlie Slater (Derek Martin), and arrived with her sisters Lynne Hobbs (Elaine Lordan) and Little Mo Morgan (Kacey Ainsworth).
 Her daughter Zoe Slater (Michelle Ryan) is initially believed to be her sister as well until Kat reveals she was raped by her uncle Harry Slater (Michael Elphick) as a child.
 She later marries Alfie Moon (Shane Richie).
 It is later revealed that Kat also gave birth to a son, Zoe's twin brother.
 She appeared in the show from September 2000 to November 2004, then returned in May 2005 following a period of maternity leave.
 She left on 25 December 2005, and returned on 17 September 2010, to leave again in January 2012 and return on 7 June 2012.
 Wallace, alongside Richie, departed on-screen on 22 May 2015, returning for a short stint from 25 December 2015 to 25 January 2016, before reprising their roles as Kat and Alfie in the six-part spin-off drama series "", in May and June 2017.
 The spin-off reveals that Kat's son is a murderous Catholic priest, Dermott Dolan (Oisín Stack) and ends on a cliffhanger where it is not known if Kat will live or die.
Jeff Miller is a fictional character in the long-running television series "Lassie" (1954–1973).
 Jeff is an eleven-year-old boy living on a weatherbeaten farm in the American midwest with his war-widowed mother, Ellen Miller, and his paternal grandfather, George "Gramps" Miller.
 The character was created by producer Robert Maxwell and Lassie trainer Rudd Weatherwax, and was portrayed by child actor Tommy Rettig.
 Jeff makes his first appearance in the series premiere, "The Inheritance" (1954), and his last appearance in the mid-fourth season episode, "Transition" (1957).
 The series won its only Emmy Awards during the character's stint on the show.

Question: When did the series premiere on which Kat Cressida voices the character of Uta?
Answer: September 17, 2009