Question: Who is the main character in the animated television series that orginally aired on Nickolodeon and featured the underwater adventures of the this title character and his friends from Bikini Bottom?

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SpongeBob SquarePants (season 3): The third season of the American animated television series "SpongeBob SquarePants", created by Stephen Hillenburg, aired on Nickelodeon from October 5, 2001 to October 11, 2004, and consists of 20 episodes.  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Hillenburg, who also acted as the showrunner.  Hillenburg halted production on the show to work on the 2004 film adaptation of the series, "The SpongeBob SquarePants Movie".  After production on the film, Hillenburg resigned from the show as its showrunner, and appointed staff writer Paul Tibbitt to overtake the position.  Season 3 was originally set to end the series after the release of the film, but the success prevented the series from ending, leading to a fourth season.

Rock Bottom (SpongeBob SquarePants): "Rock Bottom" is the 34th episode of the first season of the American animated television series "SpongeBob SquarePants".  It originally was produced in 1999 and aired on Nickelodeon in the United States on March 15, 2000.  The series follows the adventures of the title character in the underwater city of Bikini Bottom.  In the episode, SpongeBob becomes stranded in a abyssopelagic zone called Rock Bottom.

List of SpongeBob SquarePants guest stars: In addition to the show's regular cast of voice actors, guest stars have been featured on "SpongeBob SquarePants", an American animated television series created by marine biologist and animator Stephen Hillenburg for Nickelodeon.  "SpongeBob SquarePants" chronicles the adventures and endeavors of the title character and his various friends in the fictional underwater city of Bikini Bottom.  Many of the ideas for the show originated in an unpublished, educational comic book titled "The Intertidal Zone", which Hillenburg created in the mid-1980s.  He began developing "SpongeBob SquarePants" into a television series in 1996 upon the cancellation of "Rocko's Modern Life", which Hillenburg directed.  The pilot episode first aired on Nickelodeon in the United States on May 1, 1999.  The show's ninth season premiered in 2012, and episodes of "SpongeBob SquarePants" have aired.  A feature-length film adaptation of the show, "The SpongeBob SquarePants Movie", was released in 2004; in 2015, a sequel, "", was released.

SpongeBob SquarePants (season 9): The ninth season of the American animated television series "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, originally aired on Nickelodeon in the United States from July 21, 2012 to February 20, 2017, and contained 26 episodes, beginning with the episode "Extreme Spots"/"Squirrel Record".  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Stephen Hillenburg and writer Paul Tibbitt, who also acted as the showrunner for the first 15 episodes of the season.  Supervising producers Marc Ceccarelli and Vincent Waller acted as the showrunners for the remainder of the season.

SpongeBob SquarePants (season 4): The fourth season of the American animated television series "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, aired on Nickelodeon from May 6, 2005 to July 24, 2007, and contained 20 episodes, beginning with the episodes "Fear of a Krabby Patty" and "Shell of a Man".  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Hillenburg, while writer Paul Tibbitt acted as the supervising/co-executive producer and showrunner.  The show underwent a hiatus on television as Hillenburg halted the production in 2002 to work on the film adaptation of the series, "The SpongeBob SquarePants Movie".  Once the film was finalized and the previous season had completed broadcast on television, Hillenburg wanted to end the show, but the success of the series led to more episodes, so Tibbitt took over Hillenburg's position as showrunner and began working on a fourth season for broadcast in 2005.  Hillenburg remained with the show, but in a smaller advisory role in which he reviewed each episode and offered suggestions to the show's production crew.

SpongeBob SquarePants (season 5): The fifth season of the American animated television series "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, aired on Nickelodeon from February 19, 2007 to July 19, 2009, and contained 20 episodes, beginning with the special episode "Friend or Foe".  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Hillenburg and writer Paul Tibbitt, who also acted as the showrunner.

SpongeBob, You're Fired: "SpongeBob, You're Fired" is a television special of the American animated television series "SpongeBob SquarePants".  It serves as the 11th episode of the ninth season and the 189th overall episode.  The animation directors were the supervising director, Alan Smart and Tom Yasumi, and was written by Marc Ceccarelli, Luke Brookshier, and Mr. Lawrence.  Ceccarelli and Brookshier also served as storyboard directors.  The episode originally aired in Greece on July 3, 2013.  In the United States, it aired on Nickelodeon on November 11.  In this episode of the series, which follows the adventures and endeavors of the title character and his various friends in the underwater city of Bikini Bottom, SpongeBob gets fired from the Krusty Krab after Mr. Krabs discovers he can save a nickel by eliminating him.  SpongeBob subsequently decides to apply at other restaurants.

SpongeBob SquarePants (season 8): The eighth season of the American animated television series "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, originally aired on Nickelodeon in the United States from March 26, 2011 to December 6, 2012, and contained 26 episodes, beginning with the episodes "A Friendly Game" and "Oral Report".  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Hillenburg and writer Paul Tibbitt, who also acted as the showrunner.  In 2011, "SpongeBob's Runaway Roadtrip", an anthology series consists of five episodes from the season, was launched.

SpongeBob SquarePants (season 6): The sixth season of the American animated television series "SpongeBob SquarePants", created by former marine biologist and animator Stephen Hillenburg, aired on Nickelodeon from March 3, 2008 to July 5, 2010, and contained 26 episodes, beginning with the episode "Krabby Road".  The series chronicles the exploits and adventures of the title character and his various friends in the fictional underwater city of Bikini Bottom.  The season was executive produced by series creator Hillenburg and supervising producer Paul Tibbitt, who also acted as the showrunner.  In 2009, the show celebrated its tenth anniversary on television.  The documentary film titled "" premiered on July 17, 2009, and marked the anniversary. " SpongeBob's Truth or Square", a television film, and the special episode "To SquarePants or Not to SquarePants" were broadcast on Nickelodeon, as part of the celebration.

Legends of Bikini Bottom: Legends of Bikini Bottom is an anthology series of six episodes in the American animated television series "SpongeBob SquarePants", as part of its seventh season.  As the name suggests, the episodes have plots involving things like monsters, magic and mythical creatures.  The first episode called "Trenchbillies" first premiered on the online social networking service Facebook on January 27, 2011 before airing on Nickelodeon on January 29, 2011.  The four other episodes titled "Sponge-Cano!" , "The Main Drain", "The Monster Who Came to Bikini Bottom" and "Welcome to the Bikini Bottom Triangle" premiered on Nickelodeon as part of an hour-long special on January 28, 2011.  The decision to air the series online was aimed at attracting "the young and the restless hooked to the internet and the social media."

Supporting paragraphs: SpongeBob, You're Fired SpongeBob SquarePants (season 9)
Answer: SpongeBob SquarePants