"ER" is headed into the sunset this coming season, but the show is still adding new blood to its cast.

Four actors -- Shiri Appleby, Emily Rose, Julian Morris and Victor Rasuk -- will join the NBC series for its 15th and final season as new interns at County General. Another NBC show, "Knight Rider," has added Paul Campbell to its cast, according to The Hollywood Reporter.

The four "ER" actors will all have recurring parts. Appleby ("Six Degrees," " Charlie Wilson's War") and Morris ("Cry Wolf") will play siblings, she a willing learner and he a charmer who uses his looks to get by.

Rose ("Brothers & Sisters") will play a control freak who buts heads with her superiors, and Rasuk ("Stop-Loss") will play a newlywed who's often on the phone with his wife.

"The new group of young characters ... adds a burst of fresh energy and a bunch of different personalities for us to play off of as we enter our 15th and final season," executive producer David Zabel says. "While we will be reconnecting with the history of 'ER,' as well as telling the ongoing stories of our current regulars, we also will track the development of these new young doctors."

Hey There Guys!!!
Hello there...

I know it's been a long time so I wanted to drop in and say hello. I can't even begin to properly put into words my thanks and appreciation through the years. It has meant so much to me.

Okay, so here's what's been going on...

Right now, I am working on a little show called ER. I'm playing a new intern along with three other actors. We're having a blast. The cast and crew are so incredible. It's one the best sets I have ever been on. I can't wait for you all to see it. Me, a doctor? Who knew...

The reason I've been sort of MIA lately is that in March I got thrown off a horse and broke my pelvis. The horse wasn't in the best mood and I just started riding in November so I didn't have the skills to settle him down. So off I went. I'm okay now so no need to worry. I was surrounded by all my great friends and to be honest, I really loved the time at home. It was a treat to just stay in one place for a while.

Please check out the episode of Fear Itself I'm in with Brandon Routh - there isn't a nicer guy around. You'll have to check your local listings on this one. Not my speciality.

Other than that, I'm doing great. I'm planning on spending some time in New York this summer. If you have time check out Young At Heart - it's a documentary that I absolutely loved.

So again, many thanks for everything. You guys definitely know how to make a girl feel special!

Shiri