EastEnders has promised fans "a tense showdown" in Thursday night's episode.
Releasing a first-look photo, the BBC soap said: "Falling for Kat and Jake's trap, Chrissie returns to Walford and a tense showdown ensues when Chrissie and Kat come face-to-face."
Zoe is currently in prison awaiting trial for the murder of Anthony Trueman - a crime she did not commit.
Zoe and her mother Kat think Chrissie is the killer and has framed Zoe, but Anthony was actually killed by Jasmine - his daughter with Zoe.
Fans can watch what happens next on Thursday on RTÉ One and BBC One at 7:30pm.
EastEnders airs on RTÉ One and BBC One Monday to Thursday.
