Events
January
- January 6 – "The Mice" aired.
- January 13 – "Controlled Experiment" aired.
- January 20 – "Don't Open Till Doomsday" aired.
- January 27 – "ZZZZZ" aired.
February
- February 3 – "The Invisibles" aired.
- February 10 – "The Bellero Shield" aired.
- February 17 – "The Children of Spider County" aired.
- February 24 – "Specimen: Unknown" aired.
March
- March 2 – "Second Chance" aired.
- March 9 – "Moonstone" aired.
- March 16 – "The Mutant" aired.
- March 23 – "The Guests" aired.
- March 30 – "Fun and Games" aired.
April
- April 1 – Naren Shankar was born.
- April 6 – "The Special One" aired.
- April 13 – "A Feasibility Study" aired.
- April 17 – Lela Rochon was born.
- April 20 – "Production and Decay of Strange Particles" aired.
- April 27 – "The Chameleon" aired.
May
- May 1 – Maurice Dean Wint was born.
- May 4 – "The Forms of Things Unknown" aired.
- May 8 – Melissa Gilbert was born.
June
- June 26 – Ian Tracey was born.
August
- August 6 – Cedric Hardwicke died.
September
- September 19 – "Soldier" aired.
- September 26 – "Cold Hands, Warm Heart" aired.
October
- October 2 – Nora O'Brien was born.
- October 3 – "Behold, Eck!" aired.
- October 10 – "Expanding Human" aired.
- October 17 – "Demon with a Glass Hand" aired.
- October 24 – "Cry of Silence" aired.
- October 31 – "The Invisible Enemy" aired.
November
- November 7 – "Wolf 359" aired.
- November 9 – Robert Duncan McNeill was born.
- November 14 – "I, Robot" aired.
- November 21 – "The Inheritors, Part I" aired.
- November 28 – "The Inheritors, Part II" aired.
December
- December 5 – "Keeper of the Purple Twilight" aired.
- December 19 – "The Duplicate Man" aired.
- December 26 – "Counterweight" aired.
- December 30 – George Newbern was born.
Episode gallery
| Early production history | 1880s • 1890s • 1900s • 1910s • 1920s • 1930s • 1940s • 1950s |
| 1960s | 1960 • 1961 • 1962 • 1963 • 1964 • 1965 • 1966 • 1967 • 1968 • 1969 |
| 1970s | 1970 • 1971 • 1972 • 1973 • 1974 • 1975 • 1976 • 1977 • 1978 • 1979 |
| 1980s | 1980 • 1981 • 1982 • 1983 • 1984 • 1985 • 1986 • 1987 • 1988 • 1989 |
| 1990s | 1990 • 1991 • 1992 • 1993 • 1994 • 1995 • 1996 • 1997 • 1998 • 1999 |
| 2000s | 2000 • 2001 • 2002 • 2003 • 2004 • 2005 • 2006 • 2007 • 2008 • 2009 |
| 2010s | 2010 • 2011 • 2012 • 2013 • 2014 • 2015 • 2016 • 2017 • 2018 • 2019 |
| 2020s | 2020 • 2021 • 2022 • 2023 • 2024 • 2025 • 2026 |