The actor revealed that his unpredictable alter ego will be back at the forefront of the Channel 4 show in the coming months.
Scanlan told Inside Soap: "A massive storyline is going to kick in later this year. I've already seen a few of the scripts which are coming up, and some new people are going to come into Brendan's life and change it forever.
"His main motivations will remain the same, though. Power, possession, Ste - we'll be exploring each of those aspects of him. It all looks very exciting, actually."
In the meantime, a new rivalry kicks off for Brendan this week as bad boy Walker joins the village.
Scanlan said: "They met in prison while Brendan was doing time on suspicion of the murders that Silas committed. Walker looked out for Brendan, so he turns up asking for a favour in return. Brendan is aware he's a few sandwiches short of a picnic, but there's this unwritten criminal code that he knows he has to honour.
"Neil Newbon, who plays Walker, is a fascinating character on and off the set. We get on very well, but we both want to make Brendan and Walker's rivalry so palpable that the audience will be salivating while watching!"
Hollyoaks airs weeknights at 6.30pm on Channel 4, with a first-look screening at 7pm on E4.