“It becomes obvious pretty much straight away, as soon as Johnny clocks him, that there is a past there.
“It takes quite a lot to frighten Johnny, he’s no pushover and he is quite a strong guy.
“So viewers will know from the outset that this outwardly charming, funny man with his witty lines and his confidence is not all that he seems.”
The actor sinisterly added: “I can say there is definitely a past there, a dark one and I am intrigued to see what theories fans come up with.”
Coronation Street spoilers airs Monday, Wednesday and Friday on ITV at 7.30pm.