MPs, celebrities and business leaders have launched a campaign calling for a public vote on the final Brexit deal between the United Kingdom and the EU.
Sir Patrick is among those campaigners and politicians from across the spectrum who is supporting a "people power" rally in London.
Actor Sir Patrick Stewart, who backs the campaign, said if people voted to reject the exit deal, the United Kingdom would "simply stay" in the EU.
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. It was a vote in the dark two years ago.
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The Foreign Secretary part-quoted one of the sci-fi franchise's famous lines as he claimed Brexit will enable the United Kingdom to "boldly go" to areas it has neglected in recent years as it seeks trade deals.
Another one of those attending was Green Party MP and co-leader Caroline Lucas.
Actor Patrick Stewart, a supporter of the People's Vote campaign, said campaigners were not asking for a second referendum, but rather wanted "another chance to consider what the terms of this divorce are going to be".
Asked what he would say to people who voted for Brexit, he said "what we are doing is in their benefit".
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"I'm a war baby and growing up a lot of the world was not good".
"They voted with a substantial majority to leave the EU".
May has repeatedly said she will deliver what she calls the will of the people and on Sunday Foreign Minister Boris Johnson voiced optimism for the kind of deal Britain could win.
Mr Johnson addressed the remarks made by Sir Patrick, who played the role of Captin Jean-Luc Picard in Star Trek: The Next Generation.
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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".