Anyone who gets one of the Doom Slayer's many skins in DOOM: The Dark Ages can use it during any mission, including in cutscenes where Hell's greatest adversary instills fear with every action.

To change your Doom Slayer Skin in Doom The Dark Ages, go the Extras Menu from the Main Menu. From here, select Slayer Skins, and you’ll be able to switch between the different skins you unlocked.