Template:OTD/October 21

• 1999: Chapter 12 of Digimon Adventure V-Tamer 01 is published in the December 1999 issue of V Jump in Japan.
  
• 1999: Episode 12 of Digimon Tamers premieres in North America.
  
• 2000: Episode 13 of Digimon Adventure 02 premieres in North America.
  
• 2000: Chapter 24 of Digimon Adventure V-Tamer 01 is published in the December 2000 issue of V Jump in Japan.
  
• 2001: Episode 29 of Digimon Tamers premieres in Japan.
  
• 2001: Chapter 36 of Digimon Adventure V-Tamer 01 is published in the December 2001 issue of V Jump in Japan.
  
• 2002: Episode 07 of Digimon Frontier premieres in North America.
  
• 2002: Chapter 48 of Digimon Adventure V-Tamer 01 is published in the December 2002 issue of V Jump in Japan.
  
• 2006: Chapter 11 of Digimon Next is published in Japan.
• 2007: Chapter 23 of Digimon Next is published in Japan.
• 2010: Chapter 05 of Digimon Xros Wars is published in the December 2010 issue of V Jump in Japan.
  
• 2011: Chapter 16 of Digimon Xros Wars is published in the December 2011 issue of V Jump in Japan.
  
• 2013: Chapter 07 of Digimon World Re:Digitize Encode is published in the December 2013 issue of V Jump in Japan.
  
• 2015: Chapter 21 of Digimon World Re:Digitize Encode is published in the December 2015 issue of V Jump in Japan.