Henthorn will reprise the role of Julie Bates, Nigel's (Paul Bradley) estranged wife, this summer, 27 years after the character's last appearance.
Bradley returned as Nigel last year on Christmas Eve, eventually revealing he had left Julie because he didn't want his dementia to become a burden to her.
However, this week, Kat Moon (Jessie Wallace) tried to convince Nigel's friend and carer, Phil Mitchell (Steve McFadden), to contact Julie against Nigel's wishes, to help Phil cope as he struggles.
"Julie has got some awful surprises ahead of her after the initial relief she feels to discover Nigel is still alive.
"It’s been great to film with Paul and Steve (McFadden), who are such lovely actors, as Julie discovers Nigel’s dementia diagnosis and why he chose to hide it from her."
"Julie hasn’t seen Nigel in almost two years and is unaware of his diagnosis and reasons for leaving, so her arrival will pose questions for the pair of them."
Fans won't have long to wait until Julie meets up with Nigel again - but will they fully reunite?
Henthorn has also starred in The Booze Cruise, Doctors, Shameless, Trollied, Vera, Time, In the Flesh, and Heartbeat.
The actress's most recent role was as Emily in the BBC drama The Listeners.
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