Pro-Brexit campaigners also gathered outside.
Nine grassroots anti-Brexit groups have joined forces in the new campaign which is demanding a public final say on the eventual Brexit deal Prime Minister Theresa May reached with Brussels.
When asked whether it would take super powers to change the situation, the 77-year-old continued: "The two roles I am most well-known for, Jean-Luc Picard from Star Trek and Charles Xavier from X-Men, were excellent, admirable individuals - yes, intellectuals, but also compassionate and concerned for the wellbeing of everyone".
Speaking at the launch event, Liberal Democrat education spokeswoman Layla Moran said: "It may seem like the odds are stacked against us as a movement, but fighting for what you believe in is never easy. If the public demand a People's Vote, politicians will fall in line".
Pep Guardiola: 'Premier League tougher to win than Champions League'
In addition, based on three points for a win, City's now tally is the most by any side after 33 games of an English top-flight campaign.
"No-one had any idea what the consequences of Brexit were going to be".
The campaign aims to persuade people to back a public vote on the terms agreed between the United Kingdom and European Union when talks come to a close later this year. "This issue is far too important to leave to the politicians".
"I think the best and right thing to do is to put it back to the people and say you can have a vote on this deal", she said.
The actor says his two iconic characters would be anti-Brexit, but Boris Johnson says we can live long and prosper outside the EU.
Pro-West Djukanovic set to be Montenegro president
The average salary in Montenegro sits at around €500 ($615) and unemployment is more than 20 percent. President Filip Vujanovic, also of the ruling party, was not running due to term limits.
Chuka Umunna, MP for Lambeth, which had the highest Remain vote in the country, said: "We need more Conservative members of Parliament to be as fearless as Anna and many others who defied the whip and put their country before their party". "The public don't want it".
Stewart told the BBC he is supporting the People's Vote because the terms and conditions coming out of the negotiations are very different from those discussed during the 2016 referendum campaign. What I am motivated by is history and emotion. "So the day we joined was one of the most exciting days of my adulthood", he added. "We're now trying to deliver on that mandate from the people".
And they faced jibes from Brexit supporters after recruiting Star Trek actor Sir Patrick Stewart to be a leading spokesman for the group.
Foreign Secretary Boris Johnson countered with a Star Trek allusion of his own, promising that Britain's departure from the European Union will allow it "to boldly go again to areas that perhaps we've neglected over the last 45 years".
Meghan Markle returns to the United States for visa application
He said: "The emphasis will very clearly be on guests that Harry and Meghan know themselves". They look so happy, - replied the wife of David Beckham.