Returns: Tuesday, April 15, at 10 pm/Et (NBC) Number of new episodes: 5

Where we left off: Oliva Benson¹s (Mariska Hargitay) biological clock is ticking and she just can¹t escape babies. If helping to deliver Elliot Stabler¹s (Christopher Meloni) latest kid wasn¹t enough, the last pre-strike episode found the detectives investigating missing frozen embryos. That led proud papa Stabler to tell his partner she¹d make a great mom and Olivia to finally admit her desire for a child and how her attempt to adopt failed. It seems the obsessive single cop was deemed unsuitable for rug rat duty. What's next: "Olivia goes undercover in a state prison posing as a junkie," shares Mariska Hargitay. "And it turns out a guard is raping women prisoners." Even though Fin and Stabler are also undercover as a guard and a lawyer, Benson isn't safe. "She gets knocked around a lot, and it's really scary," Hargitay says. "I realized with this episode just how obsessive Olivia is, and how far she will go for justice." For more SVU preview, pick up TV Guide's Returning Favorites issue. Watch video clips | Photos | More Returning Favorites coverage