The promo teases the arrival of Sonya's (Eve Morey) long-lost relative, who appears under mysterious circumstances.
Walter's first scenes see him make a mysterious entrance into Erinsborough, watching Sonya's every move from afar.
When he finally introduces himself, Sonya is shocked as she had always thought most of her blood relatives were dead.
Sonya's initial surprise later turns to joy when Walter shares his recollections of her childhood, which bring out her own long-forgotten memories.
However, Sonya's husband Toadie Rebecchi (Ryan Moloney) suspects that all is not as it seems with Walter and urges her to be careful.
Neighbours airs these scenes later this month on Eleven in Australia, and in July on Channel 5 in the UK. Get the Inside Soap magazine on your iPhone or iPad