The former Coronation Street and EastEnders actresses were given secret earpieces after they entered the Elstree compound yesterday (Wednesday) and told to follow Big Brother's "stage directions".
The pair were told that they would need to "create a real life soap opera" with "scandal, tears and tantrums".
During the 90-minute task, Goodyear told page three model Rhian Sugden to watch out for the men in the house as she "reminded her of one of her favourite barmaids", while Fergison cried on ex-So Solid Crew member Harvey's shoulder over a fictional affair Goodyear had with one of her ex-boyfriends.
The night ended with Goodyear and Fergison having a blazing row in front of their startled new housemates, which culminated in Goodyear shouting "Don't talk s**te!" and throwing a drink in Fergison's face.
The celebrities were later gathered on the sofa and informed of Goodyear and Fergison's secret task, which won the house a soap-themed party in the garden "with a selection of the north and south's finest cuisines, including Big Brother's hotpot".
Celebrity Big Brother got under way last night with 13 famous faces entering the show, including Julian Clary, Martin Kemp and Coleen Nolan.
Celebrity Big Brother continues tonight at 10pm on Channel 5.