Anti-Brexit campaigners will fly an effigy of Boris Johnson during a 'No to Boris, Yes to Europe' rally this weekend.
The inflatable version of the Conservative leadership frontrunner is depicted wearing a shirt emblazoned with a red bus and the figure "£350m" - a reference to Mr Johnson's Brexit referendum promise of clawing back funding for the NHS.
It will be flown by campaigners from the pro-Europe group March for Change at London's Parliament Square at 10am on Saturday.
The balloon is inspired by the 'Baby Trump' blimp that mocked US President Donald Trump during his visit to the UK last month.
Tom Brufatto, one of the organisers of Saturday's protest, said the balloon carried a "serious message".
"We will not allow Boris Johnson to float into Number 10 on a favourable tailwind, or have the summer off, unopposed, after so much hot air on Brexit, with so much at stake.
"His utter contempt for British democracy, signalled by his willingness to shut down Parliament, must be challenged as he's about to receive the keys to Number 10."
A 9ft-tall representation of Brexit Party leader Nigel Farage will also be making an appearance at tomorrow's demonstration.
He will be depicted holding two puppet versions of Mr Johnson and his leadership rival, Jeremy Hunt.