The Pirates franchise is well known for its larger-than life supernatural enemies.

Keen to raise the stakes, the franchise contains two new mythical species.

First up there's mermaids. We only get a brief glimpse of them in the trailer, but we know that they're going to be easy on the eye.

Model Gemma Ward is playing queen mermaid Tamara, and actress-model Astrid Berges-Frisbey will play Syrena, who appears to fall in love with missionary Philip, played by Sam Claflin (will they be this movie's Keira and Orlando?)

The trailer also reveals some zombie hordes for Sparrow and his crew to take on.

They don't look like the Romero breed of baddies, more like particularly bad-ass pirates, or something out of a Sinbad adventure, which is no bad thing.

So, the mermaids seem to be bringing a bit of mystique, while the zombies are providing the brawny threat.

Looks like Bruckheimer and co have all bases covered, but will they end up with too much on their plates?