Actor Jonny Pasvolsky has been cast in the role of Tim, who dated Roo (Georgie Parker) when she lived in New York.
Tim is aiming to win Roo back as he arrives in the Bay unexpectedly, which is likely to stir things up for her existing relationship with Harvey Ryan (Marcus Graham).
The newcomer is billed as suave, well-dressed and sporting a "New York energy" following his time in the Big Apple.
Pasvolsky told TV Week of the storyline: "[Tim is] someone who doesn't take no for an answer, and he's after the love of Harvey's life - Roo.
"They knew each other back in New York. He was married and had an affair with her. He was completely in love with her, but chose in the end to go back to his wife. And then, subsequently, that's fallen through and he's realised that Roo was the love of his life."
While Roo is concerned over Tim's presence in the Bay, a rattled Harvey has the biggest reaction.
Pasvolsky added: "I think [Harvey] acts pretty foolish. But I think he reacts the way anybody would if they felt threatened or if they had their relationship threatened by someone."
Home and Away airs these scenes next week on Network Seven in Australia, and in October on Channel 5 in the UK.