Changes are afoot on 90210. The kids have graduated, the adults are out of the picture and there are new showrunners at the helm.

But Michael Steger says the transition from Rebecca Sinclair to Patti Carr and Lara Olsen as lead writers has been "seamless," as cast members can go to the duo about anything and the focus is simply on making season four the best one ever for this CW hit.

What will it entail for Navid?

"He's running the family business," Steger said, adding that it's switched from porn production to music video and commercial production. "But he's still being haunted by his father's past. Certain obstacles will present themselves and make life difficult."

Chief among them? His father's brother, Amal, who somehow got away with NOT being accused of child pornography.

"He thinks Navid is this naive kid who needs guidance, so he tries to play a mentor role," Steger told me. "There's a lot of animosity there."

Of course, nothing can match the animosity of last season between Navid and Adrianna, as 90210 took one of its main characters down a dark, evil path. Is there any way she can be redeemed?

No, "it's not possible," Steger says. "She's caused a ton of damages to a lot of essential characters, all the friends in her circle. But she's trying, she's on a path to redemption. It's not working so far."

The actor also tells viewers to look for "fun stuff" between Dixon and Navid, as the former will be getting into the music business and there will be plenty of opportunities for the two friends to work together. There will also be some "misunderstandings" along the way.

90210 returns with new episodes on September 13. TV Fanatic will cover each and every one of them in depth.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.