On-Site Drug Testing Harris, MO

Local Area Info: Mo Harris

Mo Harris (also known as "Big Mo") is a fictional character from the BBC soap opera EastEnders, who made her first appearance on 18 September 2000, played by Laila Morse. Mo is also played by Lorraine Stanley in a soap 'bubble' Pat and Mo, delving into her past with Pat Evans (Pam St. Clement/Emma Cooke), which aired in 2004. Mo is a highly comical character and her tendency for dodgy deals bring much of the show’s light entertainment. Morse's contract was not renewed in July 2012, but she was not immediately written out of the series and continued to make occasional appearances until 21 January 2016. Mo's reintroduction was announced in December 2017; she returned on 16 March 2018.

Mo, who previously lived in Walford, returns there after almost forty years away, with her son-in-law, Charlie Slater (Derek Martin) and granddaughters, Lynne Hobbs (Elaine Lordan), Kat Slater (Jessie Wallace), Little Mo Morgan (Kacey Ainsworth) and Zoe Slater (Michelle Ryan). Mo's rivalry with her former best friend Pat Butcher (Pam St. Clement) arises, but they reconcile at Mo's former husband and Pat's brother, Jimmy Harris's (Alex King) grave. Much of Mo's time is spent selling poor quality stolen goods and she trades with Fat Elvis (Shenton Dixon). She is assisted by Mickey (Joe Swash) and Darren Miller (Charlie G. Hawkins) and for a while sets up a sex chatline. She also works with Charlie's great-niece, Stacey Slater (Lacey Turner), on her market stall, selling clothes. She has a brief relationship with Bert Atkinson (Dave Hill), but ends it because Bert is also seeing her friend, Ina Foot (Ina Clare). They reconcile, but break up again when Bert's ex-wife, Evie Brown (Marji Campi), arrives in Walford, terminally ill. Mo begins selling cigarettes that she bought in Spain and two of her customers turn out to be Revenue and Customs officers. She is sentenced to 100 hours of community service, for tax evasion. After Stacey marries Bradley Branning (Charlie Clements), Mo tries to sell their wedding gifts.

Mo sees Charlie's partner, Brenda Boyle (Carmel Cryan), embracing another man at the tube station, but the man is Brenda's brother, Clive Robinson (Col Farrel). Brenda reveals to Mo that she is moving to Madeira with her family and Mo convinces Charlie not to let her go. However, Brenda and Charlie leave together, leaving Mo devastated. She begins drinking heavily and protests against the sale of Charlie's taxi. Charlie returns to Walford with a woman called Orlenda (Mary Tamm), but Mo does not trust her. Orlenda leaves, after admitting she was scamming Charlie, but returns his money. Mo takes charge of a children's nativity play, but fails to keep the children under control. In a raffle, she wins Max Branning's (Jake Wood) car, but sells it, to Max's dismay. When Archie Mitchell (Larry Lamb) is murdered (see Who Killed Archie?), Mo starts a betting circle on who killed him. She runs when she sees a police officer, but later, another officer appears behind her and she asks him if he wants to place a bet. She goes on holiday to Spain with Fat Elvis and when she returns, she is surprised to discover that Bradley is dead. Mo attempts to sell Lucas Johnson's (Don Gilet) bibles to the public, as gruesome souvenirs of the killer. Her insensitivity gets her thrown out of The Queen Victoria public house (The Vic). Mo receives a phone call from Kat, who wants Zoe's birth certificate. Mo meets Kat at a café and gives her the certificate. Kat admits to Mo that she conned a man and needs a new identity. Kat also lies to Mo, claiming that her husband, Alfie Moon (Shane Ritchie), is dead. Mo persuades Kat to come home and Kat reluctantly agrees, but when they get home, men are waiting for Kat and her money. However, Alfie sends them away. Mo is shocked to learn that Kat is pregnant and Alfie is not the father. When Kat goes into labour, Mo delivers her son, Tommy Moon, on the floor of The Vic's barrel store. On the same day, Ronnie Branning (Samantha Womack) gives birth to a baby boy, James Branning. On New Year's Eve, Ronnie finds that James has died and she swaps him with Tommy. Alfie and the family find the deceased baby and believe it is Tommy.