Stuart is at the centre of ructions in the Queen Vic on tonight's EastEnders on RTÉ One and BBC One.
Releasing photos from Friday's episode, the BBC says: "Emotions run high in tonight's episode as Stuart gets the wrong end of the stick and believes Mick to be having an affair with Rainie.
"Unable to control his anger, Stuart lashes out and punches Mick."
Fans can find out what happens next on RTÉ One at 8:00pm and BBC One at 8:30pm.
EastEnders airs on RTÉ One and BBC One on Mondays, Tuesdays, Thursdays and Fridays.
