A 16 year old patient comes in suffering from double vision and night terrors. House dismisses the kid but as he's leaving the hospital the patient suffers from myoclonic jerks. House thinks that the patient may be suffering from Multiple Sclerosis, but the night terror hallucinations disprove the diagnosis. As he gets worse, Cuddy is horrified at the fact that House is making bets on the child's paternity, which might be the key to solving the case. Meanwhile in the clinic, House is having to deal with a man who is trying to set up a lawsuit and a mother who refuses to give her baby vaccinations.