Who plays sue storm in fantastic 4?

That depends on which Fantastic Four movie or series you're referring to! Here's a breakdown:

Movies:

* Fantastic Four (2005): Jessica Alba plays Sue Storm, aka Invisible Woman.

* Fantastic Four: Rise of the Silver Surfer (2007): Jessica Alba also plays Sue Storm in this sequel.

* Fantastic Four (2015): Kate Mara plays Sue Storm in this reboot.

TV Shows:

* Fantastic Four (1994-1996): Rebecca Staab plays Sue Storm.

* Fantastic Four (animated series 1967-1969): Sue Storm was voiced by Gerry Anderson.

* Fantastic Four (animated series 1994-1996): Sue Storm was voiced by Catherine Disher.

So, depending on which Fantastic Four adaptation you're interested in, the answer changes!