Harry - played by Linal Haft - hasn't been on screen since late 2010, but we see him again briefly at the end of August as Vanessa swallows her pride and makes contact with him.
After losing Max's financial support when he dumped her, Vanessa (Zöe Lucker) gets in touch with Harry because she needs his help to raise funds for Jodie's wedding, according to a report in All About Soap.
Harry later sits down for a meal with Vanessa, Jodie and Darren - but it's not long before he shows his true colours once again, declaring that he'll only pay for the wedding if Vanessa doesn't turn up for the ceremony…
It's clear that Harry still wants to punish Vanessa for leaving him, but will she agree to respect his wishes? Will Jodie and Darren have to scale back their wedding plans? Or could Vanessa become further embroiled in Michael Moon's schemes to make the money she needs?
EastEnders airs Harry's ultimatum on Tuesday, August 30 at 7.30pm on BBC One.
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Watch Vanessa's EastEnders character trail below: