27 Television Pilots That Saw Significant Changes Before Air

Television pilots serve an interesting dual role in their path to becoming a series: They're both the first episode of a new show, as well as an effort to sell the premise to a potential network. As shows figure themselves out over the course of this process, they tend to see a handful of changes over time. Sometimes, in the cases of Crazy Ex-Girlfriend or The PowerPuff Girls, the original pilot was made with a much more mature demographic in mind-- and eventually have to be drastically reworked to fit their respective homes on The CW and Cartoon Network.
It's not always so extreme, but still have a series of hurdles to jump over and growing pains to navigate past-- Sometimes a casting change needs to be made, or a character that's redundant or otherwise not working and simply vanishes in between the first and second episodes of the show. Here are some of the most notable changes from pilot to finished series.
The (Original) Powerpuff Girls

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
The Amazing World of Gumball

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Powerpuff Girls

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Game of Thrones

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Steven Universe

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Jimmy Neutron

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Sherlock

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
MST3K

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Beverly Hills 90210

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Brooklyn Nine-Nine

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Saved by the Bell

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Parks & Recreation

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Seinfeld

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Gilligan's Island

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
The Pilot

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Heroes

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Adventure Time

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
South Park

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Succession

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Crazy Ex-Girlfriend

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
All in the Family

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Friends

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
30 Rock

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Fawlty Towers

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Family Guy

Source: 13 Sitcoms Whose Pilots Were Different From Later Episodes
Ancient Aliens

Source: 15 Pilots That Were Wildly Different from the Rest of the Show
Buffy the Vampire Slayer

Source: 15 Pilots That Were Wildly Different from the Rest of the Show