On several occasions the former spiritualist medium Derek Acorah was supposedly possessed by an entity, sometimes evil or sometimes "lost and confused".

Most Haunted: The Stage Show will climax by inviting some audience members to join in a séance and Ouija board on stage with the team and invited to conduct their very own ghostly investigation. Presented by Yvette Fielding, the programme investigates purported paranormal activity in a range of locations, mainly within the United Kingdom. Ciarán O'Keeffe later gave an interview to the press that Derek mentioning or being possessed by spirits Kreed Kafer and Rik Eedles was proof of his suspicions that he was faking the investigations. Originally O'Keeffe viewed the footage recorded during the investigations and analysed it, putting forward his own views and opinions, which usually included suggestions as to other possible causes for the phenomena encountered. Presented by Yvette Fielding the first lady of the paranormal together with Karl Beattie and the Most Haunted team, you will be taken on the darkest, most terrifying journey of your life.Following complaints, the broadcast regulator, Ofcom, ruled that it was an entertainment show, not a legitimate investigation into the paranormal, and "should not be taken seriously". Leap Castle in Ireland is regarded as the most haunted castle in Europe and allegedly home to many ghosts.

Alone and in the dark they experience their worst nightmare yet as they try to find out who (or what) is haunting the manor. He shared this role with his colleague Matthew Smith who frequently attended the early Most Haunted Live events. The Most Haunted team has travelled not only in the United Kingdom but also Ireland, the Netherlands, Romania, the United States, Italy, and the Czech Republic, investigating paranormal activity for 24 hours at a time. The show's presenter, Yvette Fielding, said in an interview that she believes it was a fake possession. O'Keeffe later reported that he had been grossly misquoted and misrepresented in the article, and produced a response outlining his version of the show based on his observations and findings, saying he had exposed Derek Acorah and not the entirety of Most Haunted.The seventh series began on 1 November 2005 yet only ran for six weeks, shortened from an intended nine. A pile of dog toffee, they got rid of Derek Acora, and that ddodgy get in a fat pinstripe suit, they are the types that put me off paranormal investigations.

This section outlines changes across the 23 series of Most Haunted, with detailed look at major changes through the programme's original run (series 1-14), broadcast on Living and a brief series overviews and filming location lists if the revival series (15-23), broadcast on Really. The series was broadcast every Saturday night and ran for 8 weeks, with each episode lasting two hours. Essentially, the latter two are intended to create an even balance between paranormal and scientific explanations for the various phenomena that occur. At the end of Series 5, Antix Productions began editing the series in-house at their own production offices.Karl also confirmed that a former member of the team would be joining them for an investigation and a new team member would be joining them in this series.