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The First Season of Adventures in the Underground City contained 20 episodes (1 two-parter and 18 individual episodes). The season premier was "The Sponge Who Almost Wasn't" and the season finale was "Wi-Fi Spy"


Episode

Airdate

Production Code

"The Sponge Who Almost Wasn't" 24 January 2010 101
"Drawn 2 Life" 20 February 2010 102
"Plankton's Success" 5 April 2010 103
"BobSponge ParallelPants" 4 June 2010 104
"In the Lives of Bikini Bottom" 29 July 2010 105
"Whoops, Wrong Millennium" 19 August 2010 106
"Nightmare on Conch Street" 9 September 2010 107

"Who Shot Sheldon J. Plankton?" (Part 1)

5 October 2010 108
"Who Shot Sheldon J. Plankton?" (Part 2) 9 October 2010 109
"The Joy of Hex" 23 October 2010 110
"Squid's House of Sand and Fog" 25 October 2010 111
"Where There's a Bomb There's a Bang" 13 December 2010 112
"Das Loot" 14 December 2010 113
"The Fast and the Devious" 15 December 2010 114
"The Daylight Zone" 16 December 2010 115
"The Night Before the Day After Christmas" 20 December 2010 116
"SB-Y2K11" 31 December 2010 117
"One Thousand Too Many" 9 January 2011

118

"Patrigeist" 14 January 2011 119
"Wi-Fi Spy" 15 January 2011 120