The actor, who first joined Albert Square last autumn, confirmed that the forthcoming arrival of Michael's father Eddie (David Essex) will provide an opportunity to explain the reasons behind his alter ego's behaviour.
Michael has caused a stir since arriving back in Walford at the beginning of the year, sparking problems in his cousin Alfie's relationship with Kat, sparring with new love interest Roxy Mitchell and making an enemy of her troubled sister Ronnie.
However, in an interview with We Love Telly, Shepherd confirmed: "When Michael's father arrives shortly in the shape of David Essex, we will learn a lot more about what makes Michael tick and why he is the way he is. You'll have to watch this space."
Asked about Michael and Ronnie's clashes, he added: "He takes pride in the way he dresses and he's always been quite successful with the ladies. He can't work out why Ronnie doesn't like him, so he assumes she must fancy him."
Michael is currently unaware that Ronnie has stolen the child that he fathered with Kat in the soap's baby swap storyline. However, Ronnie's secret is due to be revealed next month as the plot reaches its climax.
> Click here to read our EastEnders spoilers