Over the next few days, viewers will see that Walker (Neil Newbon) is still determined to make Brendan Brady (Emmett Scanlan) pay for what happened to his late brother - and will stop at nothing to even the score.
In a frightening showdown with his arch-enemy, Walker makes it clear that he plans to target Brendan's loved ones - leaving the frail nightclub owner with a tough and terrifying task on his hands as he battles to secure their safety.
When Brendan sees lilies on his sister Cheryl's car bonnet, he immediately recognises them as Walker's calling card and fears that the vehicle could be about to explode.
A desperate Brendan screams at Cheryl (Bronagh Waugh) to get out of the car, but when no explosion comes, it's apparent that she's not the one Walker is targeting at all…
Soon afterwards, Brendan is horrified to find Walker pointing a gun at the love of his life - Ste Hay (Kieron Richardson).
Brendan is desperate to protect his ex-lover, but in the frantic struggle that follows between him and Walker, the gun goes off and one character will be shot…
While the unlucky individual's identity is being kept firmly under wraps, we can confirm that even this shocking incident won't stop Walker in his tracks - as he soon includes Brendan's teenage son Declan (Jay Duffy) in his deadly plans.
The first Brendan hears of this is when he receives a phone call from Declan with only screams at the other end.
Walker's horrifying idea is to give Declan an overdose so Brendan gets a taste of his tragic ordeal with Cam, but viewers will have to wait and see whether Brendan can save his son in time.
With lots at stake in must-see episodes for Hollyoaks, one character won't make it through next week - but who is going to pay the ultimate price in the battle between Walker and Brendan?
Hollyoaks airs weeknights at 6.30pm on Channel 4, with first-look screenings at 7pm on E4. Get the Inside Soap magazine on your iPhone or iPad