Episode

Known Unknowns

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Next: Teamwork

Cast
Hugh Laurie as Dr. Gregory House
Robert Sean Leonard as Dr. James Wilson
Ana Mackenzie as Avery
Holly Gagnier as Michelle Berkley
Rachael Marie as Brianna
Jennifer Morrison as Dr. Allison Cameron
Jesse Spencer as Dr. Robert Chase
Lisa Edelstein as Dr. Lisa Cuddy
Andre M. Johnson as Dave
Alan Mueting as Doctor
Michael Weston as Lucas Douglas
James R. Bowers as Drummer God
Omar Epps as Dr. Eric Foreman
Annabelle Attanasio as Jordan
Lindsay Johnston as Kaitlin
Marcus Giamatti as Keener
Ron Osburn Jr. as Karate Kid
Annie Young as Madison
William Christopher Stephens as Man
Bobbin Bergstrom as Nurse
Lei'lah Star as Kid Patient
Tom Astor as Pharma Guy
Sean Field as Pharmacide Bassist
Philip Ongert as Pharmacide Publicist
William Myers as Pharmacy Rep
Elsa Morales Myers as Pharmacy Rep / 1980's Party
Bianca Collins as Phoebe
Sharon Swainson as Registration Woman
Eric Lutes as Derek Retzinger
Michael D. Nye as Joseph Schultz
Corey Miguel Curties as Security Guard
Megan Taylor as Stiletto