Regular cast non-appearances

Instances of regular cast non-appearances in an episode:
* TOS regular cast non-appearances
* TAS regular cast non-appearances
* TNG regular cast non-appearances
* DS9 regular cast non-appearances
* VOY regular cast non-appearances
* ENT regular cast non-appearances
* DIS regular cast non-appearances
* PIC regular cast non-appearances
* LD regular cast non-appearances
cs:Nevystupující stálé postavy
fr:Non-apparition des personnages principaux