PA: Due to the graphic nature of this program, viewer discretion is advised.

HOUSE AND HIS TEAM HAVE TO ACT FAST WHEN A HIGH SCHOOL STUDENT IS ADMITTED WITH A MYSTERIOUS AND LETHAL POISONING, ESPECIALLY WHEN THEY DISCOVER MORE TEENS HAVE BEEN DIAGNOSED WITH THE SAME DEADLY ILLNESS ON "HOUSE" TUESDAY, JULY 26, ON FOX

When a high school student falls victim to a mysterious but lethal poisoning, House and his team jump in to find out what is killing the teen. Given a low heart rate and a clean tox screen, House sends Cameron and Chase to the teen's home to find the hot new drug House is sure he's taking. They don't find any drugs, but think they've come up with the answers, until a second unrelated student is admitted with identical symptoms. With the boys' lives hanging in the balance, House and the team have to connect the dots � fast. Meanwhile, an 82-year-old patient has become enamored with House while he helps her figure out the basis of her renewed fascination with her sexual feelings in the "Poison" episode of HOUSE Tuesday, July 26 (9:00-10:00 PM ET/PT) on FOX. (HOU-108) (TV-14 L)

Cast: Hugh Laurie as Dr. Gregory House; Lisa Edelstein as Dr. Lisa Cuddy; Omar Epps as Dr. Eric Foreman; Robert Sean Leonard as Dr. James Wilson; Jennifer Morrison as Dr. Allison Cameron; Jesse Spencer as Dr. Robert Chase.

Guest Cast: Roxanne Hart as Margo; John Patrick Amedori as Matt; Shirley Knight as Georgia; Kurt Fuller as Mark; McNally Sagal as Mrs. Miller; Molly Mankiewicz as Blonde; Christopher Malpede as Math Whiz; Kenya D. Williamson as Nurse; Ulysses Lee as Chi Ling; Jim Lau as Chou-Young Ling; Linda Wang as Jen Ling; Andy Milder as Bus Driver