Not every show can make it into the Fall primetime lineup — and sometimes that’s a good thing. Each year, networks have to find fresh programs to fill the midseason holes they face during long hiatuses or as cancellations creep up. And for shows like “Seinfeld,” “The Office” and “Riverdale,” being up against some easy competition during winter and summer lulls may have set them up to become fan favorites. Check out a sampling below to see some of the most beloved midseason replacements in TV history — and some that are still airing — and click through our gallery for the full list.
1. “Seinfeld” — Premiered July 5, 1989 on NBC
One of the most famous sitcoms of all time debuted in the dead of summer, but that didn’t stop the self-proclaimed “show about nothing” from becoming something.
2. “Happy Days” — Premiered Jan. 15, 1974 on ABC
Maybe a winter launch was what made the Fonz so cool in the first place.
3. “Buffy the Vampire Slayer” — Premiered March 10, 1997 on The WB
Viewers were introduced to Sunnydale High School’s new vampire slayer well after the school year was already underway, but the shortened first season was enough of a hit that it came back for a second in time for the fall semester.
4. “Grey’s Anatomy” — Premiered March 27, 2005 on ABC
Shonda Rhimes began teaching us about medicine and love with the interns at Grey Sloan Memorial in the early spring of 2005, and hasn’t stopped for 17 seasons and counting.
6. “Married… With Children” — Premiered April 5, 1987 on Fox
The Bundys began delighting viewers with their trademark brand of crass humor with a truncated first season in the late ’80s and kept going for 10 more.
7. “Malcolm in the Middle” — Premiered Jan. 9, 2000 on Fox
Life may be unfair, but the viewership this Frankie Muniz-led comedy saw for its winter debut on Fox was more than generous.
8. “The Simpsons” — Dec. 17, 1989 on Fox
The Matt Groening-created cartoon premiered just before Christmas and has since become the longest-running scripted primetime TV series in the U.S.
9. “The Office” — Premiered March 24, 2005 on NBC
Though the first six episodes of “The Office” may not be as universally-beloved as the rest of its nine-season run, we’ll take a slow spring start over no Dunder Mifflin any day.
10. “Dawson’s Creek” — Premiered Jan. 20, 1998 on The WB
The now-defunct network didn’t wait for the end of winter before airing what would become one of the most famous primetime teen soap of all time.
11. “Three’s Company” — Premiered March 15, 1977
ABC came knocking on these neighbors’ door for a program to fill a spring hole in the ’70s and found a hit.
12. “3rd Rock From the Sun” — Premiered Jan. 9, 1996 on NBC
This cult classic about a group of aliens masquerading as a family of humans began airing in the winter and found a loyal following of earthlings.
13. “All in the Family” — Premiered Jan. 12, 1971 on CBS
Archie and Edith Bunker’s bickering began just after the New Year in 1971 and was so popular with viewers that it spawned three successful spinoffs: “Maude,” “The Jeffersons” and “Good Times.”
Read original story 15 Midseason TV Shows That Became Hits, From ‘The Office’ to ‘Seinfeld’ (Photos) At TheWrap