Every year, there are changes to casts on our favorite shows. We have to say goodbye to character we’ve gotten to know and love over a period of time, and we might be wary of welcoming new faces into the fold. But sometimes it’s those who fall into the latter group who become essential to the DNA of a series.

Scroll down as we take a look at some of the essential cast additions who weren’t part of our favorite shows when they originally premiered.

Kit, The Resident

Fox has officially cancelled the medical drama — recently noted by TVLine as one of 13 broadcast series with very uncertain futures — after six seasons, TVLine has learned.

“It was a great run,” series co-creator Amy Holden Jones tweeted on Thursday in response to the news. “#TheResident lives on ⁦@hulu where you can watch commercial free. Today is a day of gratitude for our amazing cast and crew and the life altering experience we shared.”

Source: TVLine