As revealed last week, actor Jonny Pasvolsky has been cast in the role of Tim, who turns up in Summer Bay hoping to rekindle his relationship with Roo.
When it becomes clear that Roo is happy with new fiancé Harvey Ryan (Marcus Graham), a persistent Tim schemes to get closer to her - offering an intriguing business proposal which would keep him in the Bay.
Georgie Parker, who plays Roo, told TV Week: "I think in her heart she probably thinks that what he's doing is to try and win her back. But there also aren't a lot of employment opportunities in Summer Bay, and he offers her work and that makes her feel good.
"She's torn between going back to what she's good at doing, which is business and marketing, and making sure she doesn't fall back into the trap of falling for him."
When Harvey later confronts Tim over his behaviour, Roo isn't pleased with her partner's interference.
Parker added: "If Harvey pushes her into a corner and forces her to make a choice, she's a pretty strong person and she wouldn't want to be stopped from doing anything she wants to do.
"She likes adventure and if she feels like her options are being limited, she would do a runner. Tim's arrival poses all these questions. Roo could be about to risk everything."
Home and Away airs these scenes next week on the Seven Network in Australia, and in October on Channel 5 in the UK.