Dot Branning makes her grand comeback to Albert Square - to find her granddaughter canoodling on her sofa.
The 'EastEnders' veteran is back in Walford after actress June Brown, who has played her since 1985, began a sabbatical in the spring of last year.
June, 85, has taken a break before, leaving for a four-year period in the 1990s.
She will be seen making her return in the BBC One soap tonight, walking into her living room to be confronted by the sight of granddaughter Lauren (Jacqueline Jossa) romping on the couch with a mystery young man.
A spokeswoman said Dot has the "fright of her life" when she walks in to find them.
"Her shock turns to horror when she later finds out that Lauren's boyfriend, Joey, is her cousin," she added.
20. Coronation Street 1997: Sally slaps Natalie for revenge on her affair
19. Brookside 1994: Beth and Margaret's lesbian kiss
18. EastEnders 1998: Tiffany is run over and killed
17. Coronation Street 1996: Raquel leaves the Street
16. Emmerdale 2011: Aaron helps Jackson end his life
12. EastEnders 2005: Den is murdered by Chrissie
15. Coronation Street 2006: Mike Baldwin dies
14. EastEnders 2009: Sonia gives birth not knowing she's pregnant
13. Emmerdale 2003: Chris poisons himself and then proceeds to frame Charity
11. Hollyoaks 2008: Niall's explosive revenge on the McQueen family
10. EastEnders 2007: Stacy and Max's affair is revealed
9. Emmerdale 1997: Kim lets Frank die
8. Coronation Street 2003: Tricky Dickie drives the Platts into the canal
7. EastEnders 2009: Danielle dies in Ronnie's arms
6. Brookside 1995: The body under the patio is dug
5. Emmerdale 1993: The plane crash
4. Coronation Street 1998: Deirdre is sent down
3. EastEnders 2001: Kat tells Zoe she's her mum
2. Coronation Street 2010: The tram crash
1. EastEnders 1994: Sharongate