2018

January
1 5  13  15  28
 * Unikitty! aired as a 6-hour series premiere across the entire day.
 * The Amazing World of Gumball aired its sixth season.
 * The Steven Universe episode "Stranded" premiered.
 * The Amazing World of Gumball aired a three-day long marathon called #CNcouchparty in honor of the show's upcoming 200th episode.
 * The Amazing World of Gumball premiered its 200th episode.
 * Wabbit, renamed "New Looney Tunes", aired its second season in Boomerang.

February
16 19  23
 * We Bare Bears aired it's season three finale.
 * Ben 10 aired its second season.
 * Super Hero President's Day Marathon aired from 6:00 PM to 8:00 PM.
 * Apple & Onion aired as a series premiere.

March
18 30
 * Be Cool, Scooby-Doo! aired its final episode and series finale on Boomerang.
 * Craig of the Creek aired as a series premiere.
 * Lego Ninjago: Masters of Spinjitzu's eighth season was released on the Cartoon Network app, website, and On Demand.

April
1 6  16
 * Richard Watterson gets Easter Day and April Fools' Day on TV shows.
 * OK K.O.! Let's Be Heroes aired its season one finale.
 * Lego Ninjago: Masters of Spinjitzu aired its Season 8 premiere.

29
30
 * Mighty Magiswords aired its season one finale.
 * Mighty Magiswords aired its second and final season.

May
5 7  13  25  28  29
 * OK K.O.! Let's Be Heroes aired its season two premiere.
 * Steven Universe aired two episodes as a half hour special.
 * The Powerpuff Girls aired its season two finale and aired its third and final season.
 * Lego Ninjago: Masters of Spinjitzu aired its Season 8 finale.
 * Regular Show makes its network debut on Boomerang.
 * Mighty Magiswords makes its network debut on Boomerang. It was later removed from Boomerang's lineup two weeks later.

June
2 3  4
 * Adventure Time and Steven Universe make their network debuts on Boomerang.
 * Justice League Action aired its season one finale.
 * Best Summer Ever aired from June 4 to July 27, 2018 at 6:00 AM until 8:00 PM.

24
25
 * Clarence aired its final episode and series finale.
 * Teen Titans Go! aired its season four finale and its season five premiere.

July
6 7  20  26  30
 * The Steven Universe episode Reunited premiered.
 * Summer Camp Island aired as a 48-hour marathon series premiere on Cartoon Network and Boomerang across the entire weekend.
 * Adventure Time aired its Minecraft special, Diamonds and Lemons.
 * Teen Titans Go! To The Movies made its theatrical debut.
 * We Bare Bears aired its fourth and final season.

August
5 11
 * Mega Man: Fully Charged aired as a series premiere.
 * Lego Ninjago: Masters of Spinjitzu aired its ninth season premiere.

13
18 23
 * Wacky Races (2017) makes its Cartoon Network debut.
 * Craig of the Creek renewed for a second season.
 * Mighty Magiswords series finale is released on the CN app.

24
25
 * Wacky Races (2017) is removed from Cartoon Network.
 * Lego Ninjago: Masters of Spinjitzu aired its ninth season finale.

September
1 2  3
 * Total DramaRama aired as a series premiere.
 * Transformers Cyberverse aired its series premiere.
 * The Powerpuff Girls "Small World" special aired.
 * Adventure Time aired its final episode and series finale.

1

 * Bunnicula reruns return to Cartoon Network.

8

 * OK K.O.! Let's Be Heroes aired it's crossover special, Crossover Nexus.

26

 * Cartoon Networks drops Bunnicula.

November
18

29
 * The Powerpuff Girls celebrated its 20th Anniversary.
 * Total Drama Island starts re-airing reruns after 4 years being off the network.
 * The Tom and Jerry Show aired its season two finale on Boomerang.

21
23
 * Dorothy and the Wizard of Oz makes its Cartoon Network debut.
 * Bakugan Battle Planet premiered.