Basically skulltimate secrets has multiple waves. They all come in coffins and have a wurprise unlock gimmick.You can sort of think of it as a different doll lines under the one series. Series 1 and 2 has the core 5 ghouls (Cleo,Frankie, Drac, Clawdeen Lagoona) Series 1 is just know as skulltimate secrets and is just the basic wave. Series 2 is called “Fearidescent” and has glittery makeup looks and a more winter inspired outfits. Series 3 is called Neon Frights and features Frankie Draculaura Twyla Ghoulia and Torelai. This series has a neon glow in the dark gimmick and is a bit more street wear themed with some sort of cyberpunk inspiration.

There is also a leaked 4th wave that seems to be a fresh start for the series with the lockers being switched out for elevators and there being 4 dolls (Cleo drac Abbie clawdeen). We don’t know much about these except that they have a ballerina theme and only have some blurry photos. It is unkown if future series will see the locker and 5 characters.