The role of Harry was previously shared by twins Freddie and Isaac Rhodes, who have been on screen since 2017.
Harry was born in 2016 and is the son of Sarah Platt (Tina O’Brien) and villain Callum Logan.
Carter-J played young Robbie Williams in Better Man (Picture: Tristan Fewings/Getty Images)
The role of Harry was previously shared by Freddie and Isaac Rhodes (Picture: ITV)
Callum was killed by Kylie Platt before Harry was born, and his body was buried underneath the annex at No.8.
After Harry’s birth, the body was discovered, and Sarah was hospitalised for postnatal psychosis, having believed that Callum was still alive.
Carter-J makes his debut as the youngest member of the Platt family amid plenty of drama.
The family are currently unaware that David and Jesse Chadwick (John Thomson) are hiding large sums of money, which David stole from notorious gangster Harvey Gaskell.
This week, the men are left panicked when Harry emerges with a fistful of the cash – will they be able to cover their tracks?
There is more drama for the Platts this week (Picture: ITV)
Elsewhere, David and Shona’s marriage is in jeopardy after a series of lies and betrayals.
After David deliberately hid visiting orders from Shona’s son Clayton, Shona cheated on David with Kit Green (Jacob Roberts).
Meanwhile, Jesse and Gail Platt (Helen Worth) have been debating a move abroad, ahead of Gail’s exit from the cobbles after 50 years.
With the pair set to tie the knot on Christmas Day, will they get their happy ever after?