The Alessi twins masqueraded as the same person using the pseudonym Linda Giles as part of a police protection programme after they witnessed a gruesome murder.
Gayle Blakeney told Ten Daily she and Gillian are "tickled pink" to be back on the show and promised fans the upcoming episodes are certainly ones to watch.
"We knew if they wanted to reprise the characters after nearly 30 years, it had to be for a great story line - which it is!" she said.
"Strangely enough, it feels just so comfortable and familiar despite the obvious changes... The cast and crew have been so welcoming," Gillian added.