Question: The Mother first appears in the episode that is part of which season of "How I Met Your Mother"?

Context articles: The Mother (How I Met Your Mother)
How Your Mother Met Me
List of Waterloo Road characters (series 8)
Satyakama Jabala
The Pineapple Incident
Gavin Sullivan
Tara Price
Lucky Penny
Slap Bet
Danny Torrance

Tracy McConnell, better known as "The Mother", is the title character from the CBS television sitcom "How I Met Your Mother".
 The show, narrated by Future Ted, tells the story of how Ted Mosby met The Mother.
 Tracy McConnell appears in 8 episodes from "Lucky Penny" to "The Time Travelers" as an unseen character; she was first seen fully in "Something New" and was promoted to a main character in season 9.
 The Mother is played by Cristin Milioti.
"How Your Mother Met Me" is the sixteenth episode of the ninth season of the CBS sitcom "How I Met Your Mother" and the 200th episode overall.
 This is the only episode of the series in which the episode title was used instead of the usual opening that featured the cast and series's title.
The following is a list of characters who appear in the eighth series of the BBC school drama "Waterloo Road", in order of appearance.
 The Eighth Series consists of Thirty Episodes, first broadcast from 23 August 2012 to 4 July 2013.
 New Main Cast Members from Episode One include Head of English (later Head Teacher) Christine Mulgrew and History Teacher Audrey McFall, with Maggie Croft (later Budgen) and Lorraine Donnegan also promoted to the Main Cast.
 New Pupil Characters from Episode One include Christine's son Connor Mulgrew, Imogen Stewart, Jade Fleming, Lula Tsibi, Rhiannon Salt and Angus Hancock.
 Head of rival school Havelock High Gerald Findlay also appears in the first five episodes.
 Episode four sees the first of several appearances of Imogen's mother Sally Stewart; Michael Byrne's father Billy debuts in the same episode, and appears until his death in Episode Ten.
 Pupil Liberty Gordon first appears in Episode Five, and Kevin Skelton (later Chalk) also joins the supporting cast in Episode Eight.
 Lorraine's sister Sonya Donnegan joins the main cast as School Secretary from Episode Nine.
 Episode Eleven sees the Barry family, consisting of mother Carol and her children Barry, Dynasty and Kacey all join the supporting cast, with pupil Jack MacAllister also debuting in the same episode.
 Towards the end of the series, supporting characters of Maintenance Assistant Ndale Kayuni, Dynasty's former boyfriend Steve-O Malone and Acting Head of Science Esther Fairclough all appear.
 Angus Deayton and Richard Mylan join the cast as Head of Modern Languages George Windsor and Deputy Head Simon Lowsley in episodes Twenty-Seven and Twenty-Nine respectively.
 Recurring Character Robert Bain, Head of Greenock Education makes his first appearance in episode Twenty-Seven, and wife of George Windsor, Princess first appears in episode Twenty-Nine.
Satyakama Jabala is a boy, and later a Vedic sage, who first appears in Chapter IV of the ancient Hindu text, the Chandogya Upanishad.
 As a boy, he enquires about his father from his mother.
 His mother Jabala, tells him that she went about many places in her youth, and did not know who his father was.
"The Pineapple Incident" is the tenth episode in the first season of the television series "How I Met Your Mother".
 It originally aired on November 28, 2005.
 It is the highest viewed episode in season 1 and the second highest overall episode during the nine seasons of "How I Met Your Mother".
 It is widely considered of the best episodes in the entire series.
Gavin Sullivan is a fictional character from the BBC soap opera, "EastEnders", played by Paul Nicholas.
 He first appears in the 5,124th episode of the show, originally broadcast in the United Kingdom on 21 August 2015.
 Gavin is the husband of Kathy Sullivan (Gillian Taylforth) and is also revealed as the biological father of Sharon Watts (Letitia Dean).
 He is first mentioned as Sharon's father in 1990 and as Kathy's husband after Kathy's departure in 2000, but does not appear on screen until 2015 and it is not known that Sharon's father and Kathy's husband are the same person until October 2015.
 Viewers are informed in a 2006 episode that Kathy and Gavin are dead, but Kathy returns in February 2015, revealing that Gavin is also alive.
 Billed as "an "EastEnders" villain like no other", Gavin has been described as "dangerous", "sinister", "nasty" and "evil".
 His storylines include his "abusive", "controlling" and "manipulative" relationship with Kathy, kidnapping recovering alcoholic Phil Mitchell (Steve McFadden) and getting him drinking again, and blackmailing Claudette Hubbard (Ellen Thomas).
 His departure involves kidnapping Kathy, causing the death of his sister Margaret Midhurst (Jan Harvey) and being arrested after threatening to kill himself and Sharon.
 He appears in 30 episodes, and his final appearance is in the 5,312th episode of "EastEnders", broadcast on 8 July 2016.
Tara first appears in the second episode of season 7, "Won't Get Fueled Again", as the replacement for murdered coroner Shannon Higgins (the original replacement for the departed Alexx Woods, who appears only in the season 6 finale).
 Tara's first job is to examine the body of a burned man on a beach.
 Eric Delko later meets her in the lab and forms an instant attraction to her.
"Lucky Penny" is the 15th episode in the second season of the television series "How I Met Your Mother" and 37th overall.
 It originally aired on February 12, 2007.
"Slap Bet" is the ninth episode in season 2 of the popular sitcom "How I Met Your Mother".
 The episode, originally titled "Robin Sparkles", first aired on November 20, 2006.
 The episode received highly positive reviews and features in several lists of the best "How I Met Your Mother" episodes in the series.
 The episode led to two recurring jokes and storylines in the show: "Robin Sparkles", Robin's teenage pop star career, and the Slap Bet, in which Marshall slapped Barney at various points throughout the series.
Daniel Anthony "Danny" Torrance is a fictional character that first appears in the 1977 novel "The Shining" by Stephen King as a child with "the shining", meaning psychic powers.
 His parents are father Jack Torrance and mother Wendy Torrance.
 The character also appears in the 1980 film adaptation "The Shining" and was played by Danny Lloyd.
 The character also appears in the 1997 TV miniseries "The Shining" and was played by Courtland Mead.
 In 2013, Stephen King released the novel "Doctor Sleep", a sequel to the 1977 novel that features an adult Danny Torrance as the protagonist.