Plot: When Howard dresses up as Sheldon for Halloween, Sheldon seeks retaliation at Leonard and Penny's Halloween party. Leonard is shocked that Penny doesn't remember their first kiss
Cast
Johnny GaleckiLeonard HofstadterJohnny Galecki was 43 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Wed, Apr 30 1975
Jim ParsonsSheldon CooperJim Parsons was 45 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Sat, Mar 24 1973
Kaley CuocoPennyKaley Cuoco was 32 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Sat, Nov 30 1985
Simon HelbergHoward WolowitzSimon Helberg was 37 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Tue, Dec 09 1980
Kunal NayyarRajesh KoothrappaliKunal Nayyar was 37 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Thu, Apr 30 1981
Melissa RauchBernadette RostenkowskiMelissa Rauch was 38 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Mon, Jun 23 1980
Mayim BialikAmy Farrah FowlerMayim Bialik was 42 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Fri, Dec 12 1975
Kevin SussmanStuart BloomKevin Sussman was 47 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Fri, Dec 04 1970
Pamela AdlonHalley Wolowitz (voice)Pamela Adlon was 52 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Sat, Jul 09 1966
David TheuneDr. GraybelDavid Theune was >> in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Unknown Birthday
Rati GuptaAnuRati Gupta was 34 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Thu, Feb 09 1984
Brian PosehnBert KibblerBrian Posehn was 52 in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Wed, Jul 06 1966
Crew
Mark CendrowskiDirectorMark Cendrowski was >> in The Big Bang Theory - Season 12 - The Imitation Perturbation (Episode 6).
Birthday: Unknown Birthday