As seen in pictures released on Sunday, Brendan's attempts to hijack Sampson's drug deal backfire next week when he and Walker (Neil Newbon) end up trapped inside a factory, surrounded by police.
Realising that someone has grassed him up to the authorities, Brendan is left to wonder who is plotting against him.
Scanlan told Inside Soap: "When Brendan gets back to the village, he has no idea where Sampson is or how the deal went so wrong.
"He's totally paranoid and suspects everyone of sabotaging his plans. He's constantly looking over his shoulder - and the situation is going to get more and more perilous."
Brendan and Walker's failed drug plot plays out in a special standalone edition of Hollyoaks which focuses entirely on the storyline.
Scanlan said: "The episode is a standalone story and is shot in the style of the movie Reservoir Dogs. It features flashbacks from when Brendan and Walker first met, and you learn about their history."
Hollyoaks airs the episode next Tuesday (August 14) at 6.30pm on Channel 4.