“She had it out for me.”

Jensen Acklesdoes not have fond memories of working withJessica Alba.

She was under an immense amount of pressure on that show.

DARK ANGEL, Jensen Ackles and Jessica Alba

Jessica Alba and Jensen Ackles on ‘Dark Angel’.Everett Collection (2)

The sci-fi show, which ran from 2000 to 2003, helped launch Alba to stardom.

Ackles joined it as a regular in season 2.

“Like the worst kind of bickering a brother and sister could do.

Jessica Alba (L), actor Jensen Ackles

Jessica Alba and Jensen Ackles.Valerie Macon/Getty Images

She had it out for me.

It wasn’t that she didn’t like me.

“So it was that kind of a relationship.

And again, if she walked in [now] we’d be all hugs.

But she didn’t make it easy on me on set.”

A representative for Alba did not immediately respond to EW’s request for comment.