Sasha Pieterse

Andie, a 9-year-old terminal cancer patient, is brought in after suffering from a hallucinogenic episode. Wilson convinces House to take the case, but he and his team struggle to diagnose what caused the hallucination. Andie handles the reality of her terminal medical situation remarkably well - so well that House questions the sincerity of her bravery and considers the possibility it may be a medical symptom.

An attempt on Calleigh's life puts both her professional and personal life in jeopardy.

The investigation of a murdered pool cleaner leads Five-0 to uncover a possible terrorist cell of radicalized students who are plotting an attack on U.S. soil.

As Claire becomes immersed in the world of the carnival, she becomes suspicious of Samuel's motives.

H.R.G. (Jack Coleman) recruits Matt (Greg Grunberg) to help him take down Samuel (Robert Knepper), as they use his long-lost love, Vanessa (guest star Kate Vernon), to lure him to them, but Samuel has his own plans for Vanessa in the works. Meanwhile, Hiro (Masi Oka) and Ando (James Kyson Lee) go to extreme lengths to save Dr. Suresh (Sendhil Ramamurthy). Elsewhere, Peter’s (Milo Ventimiglia) introduction of Emma (guest star Deanne Bray) to his mother (Cristine Rose) brings forth visions of a very grim future. Hayden Panettiere also stars. Todd Stashwick and Sasha Pieterse also guest star.