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There are five seasons of Regular Show so far.
Season One (2010)
Season One consisted of 12 episodes and started on September 6, 2010 with "The Power". It ended on November 22, 2010 with "Mordecai and the Rigbys". There were no deleted episodes, though there was some deleted media from the last episode, listed above. "The Unicorns Have Got to Go" was the most popular season 1 episode with 2.417 million viewers total.
Season Two (2010-2011)
Season Two consisted of 28 episodes. This season has less language than the first. It started on November 29, 2010, soon after the season finale of season one, with "Ello Gov'nor". The season ended on August 1, 2011 with "Karaoke Video". Like the first season, there are no deleted episodes, though some deleted media was in the last episode, listed above. "First Day" was the most popular season 2 episode with 2.364 million viewers total.
Season Three (2011-2012)
Season Three consisted of 39 episodes. Unlike the first two seasons, the foul language was removed completely and has remained that way ever since. This season is also more violent than the first two, as this is the first season to feature guns. It started on September 19, 2011 with "Stick Hockey" and as of now, there are no deleted episodes or media. The season ended on September 3, 2012 with "Bad Kiss". Fancy Restaurant was the most popular episode of season 3 with 2.934 million viewers.
- "Terror Tales of the Park" (Halloween)
- "Butt Dial" (Valentine's Day)
- "Big Winner" (April Fool's Day)
- "Trucker Hall of Fame" (Father's Day)
Season Four (2012-2013)
Season Four consisted of 37 episodes. It was confirmed on October 26, 2011 and started on October 1, 2012 with "Exit 9B". This season features a new character, Thomas, and was used in only some episodes as most of them don't feature him. This season also has more gun use than the first three. It ended on August 12, 2013 with "Steak Me Amadeus". "Terror Tales of the Park II" was the most popular episode of season 4 with 3.109 million viewers.
- "Terror Tales of the Park II" (Halloween)
- "The Christmas Special" (Christmas)
- "Do or Diaper" (Valentine's Day)
- "Fool Me Twice" (April Fool's Day)
- "Family BBQ" (Father's Day)
Season Five (2013-)
On November 1, 2012, Regular Show was renewed for a fifth season. This season will have 40 episodes most likely going by the production counting standard (half-hour specials count as two episodes in production), much like the two previous seasons. It premiered on September 2, 2013 with "Laundry Woes" and "Silver Dude".