Karla is a 2006 American psychological thriller film written and directed by Joel Bender, and co-written by Manette Rosen and Michael D. Sellers. It is based on the crimes of Canadian serial killers Paul Bernardo and Karla Homolka and stars Misha Collins and Laura Prepon as Bernardo and Homolka. Plot On 11 May 2000, a psychologist, Dr. Arnold, is conducting a session with Karla Homolka at Canada's Regional Psychiatric Centre in Saskatoon, Saskatchewan. Dr. Arnold's evaluation will determine Karla's eligibility for parole. During the session, Dr. Arnold shows Karla a photo album of herself, and her husband, Paul Bernardo, in happier times. Karla has a memory of how they first met. However, when Dr. Arnold introduces the subject of Karla's sister, Tammy Homolka, Karla becomes uncooperative. Over the following weeks, Dr. Arnold probes Karla about her knowledge of Paul's secret life as a serial rapist. It is revealed that shortly before their marriage, Paul began to rape women. Paul convinced Karla to help him rape Tammy on camera. At first Karla disagrees, but eventually steals Halcion from the veterinary clinic where she works. Tammy gets drunk at a Christmas party and becomes unresponsive after the two drug her. Tammy is raped, and ends up getting sick while drugged, choking on her own vomit. Karla calls 911, but Tammy dies and the two hide the assault evidence so her death would appear accidental. Afterwards, Paul beats Karla. Karla learns never to ruin Paul's "movies." Karla tells Dr. Arnold that Paul became obsessed with Tammy, and kept watching the video after her death, even showing it to friends. Paul also threatened to reveal Karla's role in her sister's murder, if he should get into any more trouble, but Karla finally leaves him anyway. Paul is open with Karla about his crimes yet Karla does not object even when Paul begins to bring his victims home. Although disturbed at that part of Paul's life, Karla accepts it, later claiming she, too, would have been killed if she hadn't. At Paul's request, Karla hesitantly participates in these assaults. Paul kidnaps a young girl named Tina and forces her to undress on camera. Karla witnesses this, but is too afraid to tell anyone. Tina is held for 3 days, and is raped repeatedly while Karla is "forced" to videotape it all. During one such assault, Paul strangles Tina after she sees his face. Karla tries