Kathryn Beck has been cast in the role of Gemma, who is the cousin of established regular Georgia Brooks (Saskia Hampele).
When Gemma pays a visit to Erinsborough, Georgia is delighted to see her in town. Wanting her relative to stay permanently, Georgia convinces her to move into Toadie's house.
Toadie also encourages Susan Kennedy to hire Gemma as a Biology teacher at Erinsborough High when a position opens up at the school.
However, although everything seems to be going well, it will quickly become clear to viewers that Gemma is hiding something as she remains cagey about her past.
Neighbours' official trailer for the storyline has warned that Georgia should be wary around Gemma, who has an "obsession" as she settles in on Ramsay Street.
Beck's previous roles include playing Lily Nelson on Home and Away.
Neighbours airs Gemma's arrival on October 7 in Australia and November 4 in the UK.
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