Another superhero appeared in support of the People's Vote, with Lord Adonis tweeting a picture of himself with EU Supergirl and self-proclaimed "professional trouble-maker" Madeleina Kay who fronted the Labour peer's campaign to encourage young people to emotionally blackmail their elderly grandparents and relatives into reversing their support for Brexit.
Both the Conservatives and Labour have ruled out a second referendum.
Opponents of leaving the European Union have identified winning enough support in the lower house of parliament, the House of Commons, to block any possible deal the government brings back from Brussels as their best chance of overturning Brexit.
Actor Patrick Stewart, who backs the campaign, said that the United Kingdom would "simply stay" in the European Union if the vote rejected the exit deal.
Green MP Caroline Lucas will say: "We will be making the case in Parliament, but this is too big and too important to be determined exclusively by politicians".
Speaking at the rally, Green Party co-leader Caroline Lucas said: "We'll do everything we can in Parliament for a people's vote".
He also said he was motivated by "history and emotion" to want to stay in the EU.
"I'm a war baby and growing up a lot of the world was not good".
Actor Stewart said in a media interview Sunday that if people voted to reject the exit deal, Britain would simply stay in the EU. "We're now trying to deliver on that mandate from the people", Mr Johnson told Mr Marr.
Business leaders and celebrities including Mirfield-born actor Sir Patrick Stewart have launched a campaign for a public vote on the final Brexit deal.
"The idea that uncertainty is going to disappear next year is quite wrong".