April 21 is the 111th day of the year (112th in leap years) in the Gregorian calendar. There are 254 days remaining.
- 2017: "Burst Your Bubble" premiered in Latin America.
- 2019: "Boating School" premiered in Bangladesh.
- 2020: "Plankton's Old Chum" premiered in Australia and New Zealand.
- April 21 on Wikipedia
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