The default query for the API cast & crew is to look at the last season. As you can see here, season 17 of NCIS doesn't have any crew added.

The view you see here on the website is a bit different. It's aggregating the cast & crew for the whole series. This feature hasn't been implemented on the API yet. You can find the ticket tracking this here.

Shouldn't be hard to aggregate in my own database. I see that the 502 is fixed now.

Thanks for the info. If you need someone who's very picky let me know if you need a tester

I am going to leave this here for anyone using the Laravel framework.
Add this to your TV model.

public function getDirectorsAttribute()
{
    // Get all episodes with crew relation data.
    $tv = Episode::where('tv_id', $this->id)
        ->with('crew')
        ->get();

    // Loop trough every episode.
    $crew = [];
    foreach($tv as $episode){
        foreach($episode->crew as $item){ 
            // Filter on Directors.
            if ($item->job == 'Director') {
                $crew[] = $item->name;
            }
        }
    }
    // sort directors by amount of episodes directed and order them from high to low.
    $count = array_count_values($crew);
    arsort($count);

     // Take only directors with a minimum of 10.
    $directors = [];
    foreach($count as $item => $amount){
        if($amount > 10){
            $directors[] = $item;
        }
    }
    // Implode directors to single line comma separated and add a space after comma.
    return str_replace(',', ', ', implode(",", $directors));
}