What wouldModern Familybe without watching the kids grow up?
And how could procedural shows likeCriminal Mindsdepict big breaks in cases without some time passing in between findings?
Theres a reason whySupernaturalis the CWs longest-running series - with aprequel currently in production.
After all, the cases from the FBI and its Behavioral Analyst Unit (B.A.U.)
are some of the most thrilling and intriguing to watch season after season.
They welcomed new members to the family and mourned the loss of old ones.
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You witness her mistakes and triumphs as a doctor until she eventually declares a specialty.
But 18 seasons later, Meredith and her colleagues continue to save lives.
ButGreys Anatomycontinues to churn out more drama and medical cases and is alreadygearing up for the 19th season.
Image via The CW
NEXT:The 10 Longest Running Sci-Fi TV Series
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