It is quite obvious that Monsters vs Aliens Nickelodeon series aired on Nickelodeon around the world, however, ever since Pizzavision launched, it had acquired programming alongside original programming like Neddy - acquired programming includes Nickelodeon shows, and in 2023, Monsters vs Aliens Nickelodeon series was included.

Outside of feeds launched after 2023 (like the localised Polish feed, launched on February 20th 2025), Monsters vs Aliens premiered on Pizzavision feeds between April-September 2023.

Shockingly, it didn't first premiere on Pizzavision in the UK, instead it started in Latin America and Brazil, both premiering it on April 29th 2023.

Pan-European feed premiered it on Pizzavision on May 22nd, 2023, but Bosnian, Kazakh, Macedonian, Slovak and Ukrainian audio launched on May 31st 2023, so those languages premiered on Pizzavision on that date (this is the first time that the Bosnian dub saw release!), Tajik audio launched on February 15th 2024, so that language premiered on that date (so three datws for Pan-European feed).

Most other feeds premiered it in May 2023, some after May 2023 (Germany premeired it on July 3rd 2023), last one was Portugal, premiering it in September 2023. Write premiere dates for all feeds, specify too, most feeds premiered on a Monday (but not the same Monday, apart from Denmark, Norway and Sweden), expect Latin America and Brazil (we already said April 29th 2023, that is a Saturday) and Japan (either a Saturday or a Sunday):
These are:
Africa
Arabia
Australia and New Zealand
Canada
Denmark
Finland
France
Germany
Greece
Israel
Italy
Japan
Latin America and Brazil
Norway
Pan-European feed (three dates; main premiere (Albanian, Bulgarian, Croatian, Czech, English, Estonian, Hungarian, Latvian, Lithuanian, Polish, Romanian, Russian, Serbian, Slovenian and Turkish), Bosnian, Kazakh, Macedonian, Slovak and Ukrainian premiere and Tajik premiere)
Portugal
South Korea
Southeast Asia
Spain
Sweden
Treaca (fake country, speaks both English and Treacian)
United Kingdom
United States

Also add localised titles next to the airdates:
English, Danish, Dutch, Finnish, German, Indonesian, Malay, Norwegian and Treacian - Monsters vs Aliens
Albanian - Përbindëshat kundër alienëve
Arabic - الوحوش ضد المخلوقات الفضائية
Bosnian, Croatian and Serbian - Čudovišta protiv vanzemaljaca
Bulgarian - Чудовища срещу извънземни
Chinese - 怪獸大戰外星人
Czech - Monstra vs. Vetřelci
Estonian - Koletised tulnukate vastu
French - Monstres contre Aliens
Greek - Τέρατα κι Εξωγήινοι
Hebrew - מפלצות נגד חייזרים
Hungarian - Szörnyek az űrlények ellen
Italian - Mostri contro alieni
Japan - モンスターVSエイリアン
Kazakh - Монстрлар қарсы шетелдіктер
Korean - 몬스터 vs 에일리언
Latvian - Monstri pret atnācējiem
Lithuanian - Monstrai prieš ateivius
Macedonian - Чудовишта против вонземјани
Polish - Potwory kontra Obcy
Portuguese - Monstros vs Alienígenas (Brazil) and Monstros vs Aliens (Portugal)
Romanian - Monștri contra extratereștri
Russian - Монстры против пришельцев
Slovak - Monštrá vs. Votrelci
Slovenian - Pošasti proti Nezemljanom
Spanish - Monstruos vs Aliens (Latin America) and Monstruos contra alienígenas (Spain)
Tajik - Монстрҳо против ғарибон
Thai - มอนสเตอร์ ปะทะ เอเลี่ยน
Turkish - Canavarlar Yaratıklara Karşı
Ukrainian - Монстри проти прибульців
Vietnamese - Quái vật ác chiến người ngoài hành tinh