On 21 April, a number of people important to the production of Doctor Who and its spin-offs either died or were born.
- 1906 - Actor Aimée Delamain was born.
- 1927 - Actor Alan Chuntz was born.
- 1927 - Actor Gerald Flood was born.
- 1935 - Script editor Anthony Read was born.
- 1943 - Actor Sue Pulford was born.
- 1963 - Actor Cory Pulman was born.
- 1969 - Telesnap photographer John Cura died.
- 1973 - Actor Katsuyuki Konishi was born.
- 1996 - Abzorbaloff creator William Grantham was born.
- 2002 - Fight arranger Terry Walsh died.
- 2010 - Designer David Myerscough-Jones died.
- 2018 - Actor David Grey died.