Lister explained the couple's relationship saying: "there's something about those two - they are an absolute nightmare when they are together because they either fall out or one of them does something that jeopardises the relationship.But they always keep coming together, back to one another. Chas plans to expose Carl's affair on their wedding day, Lister explained that Chas begins "losing confidence in the whole revenge plan because she realises how much she would actually love to marry him and would love to have a family with him".
He explained that Carl was "thrilled" at Chas' pregnancy and he now wants to "give Chas whatever she wants - a big Christmas day wedding, anything to make her happy".Obviously Lexi knows that Carl killed his father, but she doesn't know that Chas was the reason. I think rather than being backed into a corner, part of Carl thinks that if Chas has knocked him back, he'll try and do right by Lexi".Lister told Kris Green of Digital Spy that Carl enters the relationship with the best intentions instead of "wishing he was with Chas all the time" who will always be in the "background".When Chas rejects Carl he marries Lexi but the marriage soon after ends when Carl admits he does not love Lexi.Carl reunites with Chas but becomes tempted reignite his affair with Eve Jenson (Suzanne Shaw).
Lister made his first appearance on the show on 6 February 2004.