Fans of the soap were horrified as the Walford veteran got close to her ex-husband while he was passed out drunk.
Martin was seen sleeping off a big night out on Dot's bed and Sonia stroked his hair before leaning in for a kiss.
The former couple have been growing close again in recent weeks after Martin's split from Stacey.
Sonia has now proved she's still got feelings for her ex despite dating Tina after their break-up.
However, fans were not happy about the former lovers getting back together.
They flocked to Twitter to beg Sonia not to return to her former husband.
One wrote: "Oh no. DO NOT DO IT ON DOT’S BED Sonia!!! *screams* #Eastenders."
Another added: "Sonia stop it #eastenders."
A third wrote: "So Sonia fancying Martin again, but he should be with Stacey, tho she’s not very deserving after cheating #EastEnders."
One more tweeted: "Leave martin and sonia in 2003 where they belong please #Eastenders."
Tonight's episode also featured a hilarious spat between Kim and Phil.
Viewers were convinced Kim dropped the F-bomb as she yelled: "Back off Phil".
They headed to Twitter to debate whether she had told the Walford tough guy to "f*** off".
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