Julie Goodyear, who played popular character Bet Gilroy in ITV soap Coronation Street, is returning to the show for a second time later this year.
Goodyear is popular with the viewers
Goodyear will be joined Bev Callard and Charlie Lawson (Liz and Jim McDonald), who are also coming back in a separate storyline.
The trio will only appear in 10 episodes which will be filmed on location in Blackpool over a two-week period in November.
The McDonald and Gilroy stories will not be interlinked even though both plots will be based in the seaside resort.
A spokeswoman for the show said: "It's great news - they are all popular
Viewers will see Liz meet daughter-in-law Karen (Suranne Jones) for the first time.
Callard appears in Two Pints of Lager and a Packet of Crisps
The pair have met before but only off-screen.
The spokeswoman said: "It will be interesting to see how Karen and Liz get on
- sparks are bound to fly."
The storylines will be woven into the usual four-weekly episodes rather than being dedicated special programmes.
Goodyear left the show after 26 years in 1995 before returning to the soap in May last year.
But she only appeared on TV screens for two weeks before being forced to leave due to exhaustion.
Producers enlisted comedian Maureen Lipman to fill in as temporary bar manager while the plot was altered to make Lynch go back to her home in Brighton.
The Blackpool special will be the first time Goodyear has appeared on Coronation Street since then.
Bet Lynch is considered one of the best-loved characters in British soap history and is famed for her big earrings and loud clothes.
Bev Callard left the soap in 1998 and her on-screen husband, Charlie Lawson, was axed two years later.
Callard also made a brief return to the Street for three months in October 2000 when she remarried Jim in a prison ceremony.
She later appeared in BBC Two comedy Two Pints of Lager and A Packet of Crisps.
Jim was last seen in Coronation Street serving a jail sentence for the manslaughter of drug dealer Jez Quigley.
He landed a role in the award-winning West End play Art alongside former Spandau Ballet member Gary Kemp in 2001.