Here are Cartoon Network, Cartoonito, and HBO Max's premieres for May. The info here may be incomplete and is subject to change. If I missed anything or made any mistakes, please let me know and I'll add/fix it as soon as I can.
Cartoonito
Bing
Monday, May 2 - 8:10 A.M. (EST) - 124B - Cake
Tuesday, May 10 - 8:20 A.M. (EST) - 124C - Not Yours
Tuesday, May 17 - 8:20 A.M. (EST) - 125A - Mine
Monday, May 23 - 8:10 A.M. (EST) - 125B - Lunch
Tuesday, May 31 - 8:10 A.M. (EST) - 125C - Woof
Love Monster
Monday, May 2 - 7:50 A.M. (EST) - 227 - Very Dark Night [SEASON FINALE]
Lucas the Spider
Friday, May 6 - 8:30 A.M. (EST) - 141-143 - Sleeping Dogs/Skunked/Arlo and the Snake
Friday, May 13 - 6 A.M. (EST) - 144-146 - Crack in the Tank/Big Mouth/Art From the Heart
Friday, May 20 - 6 A.M. (EST) - 147-149 - Lucas and His Friends/The Owl That Said Why/Happy Burpday
Friday, May 27 - 6 A.M. (EST) - 150-152 - The Legend of Big Butt/Arlo Needs a Nap/Everyone's a Critic
Mecha Builders
Monday, May 9 - 8:30 A.M. (EST) - 102 - Mecha Builders Pull Together/Lift Up and Lift Off
Monday, May 9 - 9 A.M. (EST) - 103 - That Old Time Rock Rolls/Make Like a Banana Split
Monday, May 9 - 9:30 A.M. (EST) - 104 - Magnet Mayhem/Stop That Train
Monday, May 9 - 10 A.M. (EST) - 105 - Picture Perfect Park Party/Sun Block
Monday, May 16 - 8 A.M. (EST) - 106 - Roll, Chickens, Roll/Ramp Up, Up, and Away
Monday, May 16 - 8:30 A.M. (EST) - 107 - Yip Yip, Book Book/Stick to It
Monday, May 16 - 9 A.M. (EST) - 108 - The Treasure of Treetop Woods/The Zee Mobile
Monday, May 16 - 9:30 A.M. (EST) - 109 - Mecha Machine Makers/That's the Way the Windmill Blows
Monday, May 16 - 10 A.M. (EST) - 110 - The Need for Feed/Zipline Sisters of Treetop Woods
Pocoyo
Monday, May 2 - 7:30 A.M. (EST) - 341 - Pocoyo Goes to School
Wednesday, May 4 - 7:30 A.M. (EST) - 342 - Art
Friday, May 6 - 7:30 A.M. (EST) - 343 - Pocoyo Recycles
Tuesday, May 10 - 8 A.M. (EST) - 344 - Down on the Farm
Wednesday, May 11 - 8 A.M. (EST) - 345 - Nurse Elly
Friday, May 13 - 8 A.M. (EST) - 346 - Fishing
Tuesday, May 17 - 8 A.M. (EST) - 347 - Hole Lotta Trouble
Wednesday, May 18 - 8 A.M. (EST) - 348 - Chicks Dig Me
Friday, May 20 - 8 A.M. (EST) - 349 - Call Me
Monday, May 23 - 8 A.M. (EST) - 350 - Angry Alien Strikes Back
Wednesday, May 25 - 8 A.M. (EST) - 351 - Muck Struck
Friday, May 27 - 8 A.M. (EST) - 352 - Hack Attack
Tuesday, May 31 - 8 A.M. (EST) - 353 - Nina
Thomas & Friends: All Engines Go!
Monday, May 2 - 9 A.M. (EST) - 219 - Ghost Train
Tuesday, May 10 - 8:30 A.M. (EST) - 220 - Hide and Surprise
Tuesday, May 17 - 8:30 A.M. (EST) - 221 - Pop a Wheelie
Monday, May 23 - 9 A.M. (EST) - 222 - Goodbye, Ghost-Scaring Machine
Tuesday, May 31 - 9 A.M. (EST) - 223 - More Cowbell
Cartoon Network
Teen Titans GO!
Saturday, May 14 - 6:45 P.M. (EST) - 738 - Finding Aquaman
Monday, May 23 - 6 P.M. (EST) - 739 - Whodundidit?
Tuesday, May 24 - 6 P.M. (EST) - 740 - Sweet Revenge
Wednesday, May 25 - 6 P.M. (EST) - 741 - Porch Pirates
Thursday, May 26 - 6 P.M. (EST) - 742 - A Sticky Situation
Friday, May 27 - 6 P.M. (EST) - 743 - The Perfect Pitch?
Tig N' Seek
Thursday, May 26 - Season 4 [HBO Max]
We Baby Bears
Monday, May 2 - 6 P.M. (EST) - 121 - Sheep Bears
Tuesday, May 3 - 6 P.M. (EST) - 122 - Ice Bear's Pet
Wednesday, May 4 - 6 P.M. (EST) - 123 - Dragon Pests
Thursday, May 5 - 6 P.M. (EST) - 124 - No Land, All Air!
Friday, May 6 - 6 P.M. (EST) - 125 - Tooth Fairy Tech
Movies/Specials
Sunday, May 1 - 6 P.M. (EST) - Crazy Rich Asians
Sunday, May 8 - 6 P.M. (EST) - Aquaman
Friday, May 13 - 6 P.M. (EST) - Hotel for Dogs
Saturday, May 14 - 4 P.M. (EST) - Aquaman: King of Atlantis
Sunday, May 15 - 6 P.M. (EST) - Rampage
Sunday, May 22 - 6 P.M. (EST) - Journey 2: The Mysterious Island
Saturday, May 28 - 6 P.M. (EST) - Teen Titans Go! & DC Super Hero Girls: Mayhem in the Multiverse
Cartoonito
Bing
Monday, May 2 - 8:10 A.M. (EST) - 124B - Cake
Tuesday, May 10 - 8:20 A.M. (EST) - 124C - Not Yours
Tuesday, May 17 - 8:20 A.M. (EST) - 125A - Mine
Monday, May 23 - 8:10 A.M. (EST) - 125B - Lunch
Tuesday, May 31 - 8:10 A.M. (EST) - 125C - Woof
Love Monster
Monday, May 2 - 7:50 A.M. (EST) - 227 - Very Dark Night [SEASON FINALE]
Lucas the Spider
Friday, May 6 - 8:30 A.M. (EST) - 141-143 - Sleeping Dogs/Skunked/Arlo and the Snake
Friday, May 13 - 6 A.M. (EST) - 144-146 - Crack in the Tank/Big Mouth/Art From the Heart
Friday, May 20 - 6 A.M. (EST) - 147-149 - Lucas and His Friends/The Owl That Said Why/Happy Burpday
Friday, May 27 - 6 A.M. (EST) - 150-152 - The Legend of Big Butt/Arlo Needs a Nap/Everyone's a Critic
Mecha Builders
Monday, May 9 - 8:30 A.M. (EST) - 102 - Mecha Builders Pull Together/Lift Up and Lift Off
Monday, May 9 - 9 A.M. (EST) - 103 - That Old Time Rock Rolls/Make Like a Banana Split
Monday, May 9 - 9:30 A.M. (EST) - 104 - Magnet Mayhem/Stop That Train
Monday, May 9 - 10 A.M. (EST) - 105 - Picture Perfect Park Party/Sun Block
Monday, May 16 - 8 A.M. (EST) - 106 - Roll, Chickens, Roll/Ramp Up, Up, and Away
Monday, May 16 - 8:30 A.M. (EST) - 107 - Yip Yip, Book Book/Stick to It
Monday, May 16 - 9 A.M. (EST) - 108 - The Treasure of Treetop Woods/The Zee Mobile
Monday, May 16 - 9:30 A.M. (EST) - 109 - Mecha Machine Makers/That's the Way the Windmill Blows
Monday, May 16 - 10 A.M. (EST) - 110 - The Need for Feed/Zipline Sisters of Treetop Woods
Pocoyo
Monday, May 2 - 7:30 A.M. (EST) - 341 - Pocoyo Goes to School
Wednesday, May 4 - 7:30 A.M. (EST) - 342 - Art
Friday, May 6 - 7:30 A.M. (EST) - 343 - Pocoyo Recycles
Tuesday, May 10 - 8 A.M. (EST) - 344 - Down on the Farm
Wednesday, May 11 - 8 A.M. (EST) - 345 - Nurse Elly
Friday, May 13 - 8 A.M. (EST) - 346 - Fishing
Tuesday, May 17 - 8 A.M. (EST) - 347 - Hole Lotta Trouble
Wednesday, May 18 - 8 A.M. (EST) - 348 - Chicks Dig Me
Friday, May 20 - 8 A.M. (EST) - 349 - Call Me
Monday, May 23 - 8 A.M. (EST) - 350 - Angry Alien Strikes Back
Wednesday, May 25 - 8 A.M. (EST) - 351 - Muck Struck
Friday, May 27 - 8 A.M. (EST) - 352 - Hack Attack
Tuesday, May 31 - 8 A.M. (EST) - 353 - Nina
Thomas & Friends: All Engines Go!
Monday, May 2 - 9 A.M. (EST) - 219 - Ghost Train
Tuesday, May 10 - 8:30 A.M. (EST) - 220 - Hide and Surprise
Tuesday, May 17 - 8:30 A.M. (EST) - 221 - Pop a Wheelie
Monday, May 23 - 9 A.M. (EST) - 222 - Goodbye, Ghost-Scaring Machine
Tuesday, May 31 - 9 A.M. (EST) - 223 - More Cowbell
Cartoon Network
Teen Titans GO!
Saturday, May 14 - 6:45 P.M. (EST) - 738 - Finding Aquaman
Monday, May 23 - 6 P.M. (EST) - 739 - Whodundidit?
Tuesday, May 24 - 6 P.M. (EST) - 740 - Sweet Revenge
Wednesday, May 25 - 6 P.M. (EST) - 741 - Porch Pirates
Thursday, May 26 - 6 P.M. (EST) - 742 - A Sticky Situation
Friday, May 27 - 6 P.M. (EST) - 743 - The Perfect Pitch?
Tig N' Seek
Thursday, May 26 - Season 4 [HBO Max]
We Baby Bears
Monday, May 2 - 6 P.M. (EST) - 121 - Sheep Bears
Tuesday, May 3 - 6 P.M. (EST) - 122 - Ice Bear's Pet
Wednesday, May 4 - 6 P.M. (EST) - 123 - Dragon Pests
Thursday, May 5 - 6 P.M. (EST) - 124 - No Land, All Air!
Friday, May 6 - 6 P.M. (EST) - 125 - Tooth Fairy Tech
Movies/Specials
Sunday, May 1 - 6 P.M. (EST) - Crazy Rich Asians
Sunday, May 8 - 6 P.M. (EST) - Aquaman
Friday, May 13 - 6 P.M. (EST) - Hotel for Dogs
Saturday, May 14 - 4 P.M. (EST) - Aquaman: King of Atlantis
Sunday, May 15 - 6 P.M. (EST) - Rampage
Sunday, May 22 - 6 P.M. (EST) - Journey 2: The Mysterious Island
Saturday, May 28 - 6 P.M. (EST) - Teen Titans Go! & DC Super Hero Girls: Mayhem in the Multiverse
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