In the Season 2 premiere, a new administrator (Henry Winkler) joins the hospital, piquing the Chief's interest. Elsewhere, Cat deals with her unplanned pregnancy, and Glenn makes a medical breakthrough.

Lola returns from the grave; Cat goes into labor as Nicky takes a turn for the worse.

Owen goes to the spirit world to find Lola; Chief has a terrifying encounter in the maternity ward; several patients in costumes arrive on Halloween.

Blake's brother visits and shares unsettling news; an amusement-park mascot is hiding something; and a section of the hospital doubles as a youth hostel.

Two men (Ernie Hudson and Mark L. Young) are impaled by a pole, forcing the doctors to choose who should live; Lola treats "Star Trek" fans (Adam Scott and Clark Duke); and insult comic Jeffrey Ross comes to the hospital with an emergency.

A news show chronicles the end of "Childrens Hospital."

Owen treats a boy with a knife in his chest; Glenn is pressured to squash his cure for cancer; and a telepath is admitted to the hospital.

A heat wave and subsequent power outage cause chaos at the hospital: Blake is violated in a closet and Dori comes up with a new way to make eggs.

A rabbi puts the moves on Valerie, making Glenn jealous; Sy frets over a coffee machine; and an organ in a cooler mystifies Lola.

Chief's daughter (Lizzy Caplan) visits the hospital; the doctors have trouble determining a patient's gender.