NBC
But despite the research and talent involved, creating a hit isn't always that predictable, to the chagrin of executives.
The TV graveyard is full of failed spinoffs that should've been hits. And for every "Better Call Saul" that's chugging along fine, there are many spinoffs that never capture the glory of their predecessors.
Here's a look at 10 of those failed TV spinoffs that really should've done better.