Mark Beltzman

When several people die suddenly and without warning five years after receiving transplants from a single organ donor, House and the team rush to save the only two surviving recipients. With one already dying and the other healthy but sure to fall ill at any moment, the team must find out what was wrong with the original organ donor. As the team sorts through the records on the deceased donor recipients to find the common thread, they must deal with a new intrusion. House has hired Lucas (guest star Michael Weston), a private investigator, to dig up information about the deceased despite the team’s skepticism. Meanwhile, House auditions new best friends to replace Wilson, and soon uses Lucas for his own personal means to spy on Wilson and the other team members.

After the homecoming dance, the girls try to sort out the devastation, plus "A" isn't the only one sending Aria texts.

Jerry becomes obsessed when his date refuses to sample his pie; a clothing store mannequin resembles Elaine.

When Colleen and Matt miss all the flights to Mexico for their wedding, they question if they will ever get married. Also, Greg and Jen get into trouble when they share a cookie with a fellow plane passenger who has a severe allergic reaction to it, Joan and John rush their dog to the vet after he swallows Matt’s wedding ring, and the Hughes family moves into Tyler and Clementine’s tiny house when a fire breaks out in their kitchen.

When Greg and Jen take Lark on her first airplane trip, their parental skills are upstaged by another couple travelling with their baby. Also, Joan and John attempt to smuggle their dog, Tank, onto the plane; Matt and Colleen miss their flights when they accept travel vouchers for airline credits; and Heather and Tim run into countless obstacles when trying to get to the airport on time.