Season 4

Season premiere aired on January 26, 2018. Season finale aired in a special two-parts episode on February 8 and February 15, 2019. This season featured the 100th episode.

Epi

 * 1) Everybody Lies To Everybody (Part Two) - February 2, 2018 - 5.2 million
 * 2) Jewish K.C. Gets Trouble - February 9, 2018 - 4.8 million
 * 3) Neighbors Finally Find Out? February 23, 2018 - 4.6 million
 * 4) If I Weren't A Boy I Would've Hit You Already - March 2, 2018 - 4.3 million
 * 5) We Have Chemistry... On Monday, Third Hour - March 9, 2018 - 4.0 million
 * 6) Coopers In The Middle - March 30, 2018 - 4.1 million
 * 7) I Don't Get Your Mistrust - April 6, 2018 - 3.8 million
 * 8) Crazy Mission With My BFF - April 13, 2018 - 3.9 million
 * 9) Hit Little Judy - May 4, 2018 - 3.7 million
 * 10) Shake It Up Undercover: Another Mission in Chicago - May 18, 2018 - 4.8 million
 * 11) Albert Einstein's Grandson - June 8, 2018 - 4.0 million
 * 12) Hunks On The Beach For K.C. - June 15, 2018 - 3.9 million
 * 13) The Special And Lost 100th Episode - June 22, 2018 - 4.1 million
 * 14) We've Got Some Dangerous Plans! - July 13, 2018 - 3.9 million
 * 15) When It's Meant To Be, It's Destiny Callin' - July 27, 2018 - 3.7 million
 * 16) Sounds Of Summer - August 10, 2018 -
 * 17) Mary Had A Little Spy - September 14, 2018 - 3.7 million
 * 18) Mission Under The Light Of The Moon - September 21, 2018 - 3.8 million
 * 19) Ernie's New Dark Side - October 5, 2018 - 4.7 million
 * 20) School Musical Goes Wrong - October 12, 2018 - 3.9 million
 * 21) I Like To Scare People When People Think Will Scare Me - October 26, 2018 - 4.0 million
 * 22) You're Not The Same Boy I Knew Last Year - November 16, 2018 - 4.5 million
 * 23) Maybe We're Not Supposed To Be A Couple - November 23, 2018 - 4.7 million
 * 24) Badfellas And Bad Mood - December 7, 2018 - 3.9 million
 * 25) Marisa's First FanFiction On Web - December 14, 2018 - 4.1 million
 * 26) When The Lights Come Up It's Hard To Hold Back - January 11, 2018 - 3.9 million
 * 27) I Thought We Were On A Break! - January 18, 2018 - 4.7 million
 * 28) Just Do It, And You'll Get What You Want - January 25, 2018 - 4.5 million
 * 29) The Final Misson - January 31, 2019 - 6.0 million

Trivia

 * This season featured the 100th episode.
 * It's shown Marisa's talent: she's a good writer.
 * K.C. and her boyfriend break up after a year relationship, but get back together after four episodes.
 * "I Thought We Were On A Break" is a referrence to Ross's phrase in Friends
 * This season featured the most watched episode of the series, also the last one, with 6 million viewers.
 * This is also the most watched season (4.3 million average viewers)
 * Finally the Organization finds out Marisa knows the Coopers are spies.
 * There's a crossover with Shake It Up. Zendaya, that plays the characters of K.C. and Rocky on Disney Channel, had a double role for this episode, but the characters never met until the end of the episode.
 * Ernie gets braver and more protective, as a spy should always be.
 * This is the only season that lasts more than a year.