President-elect Donald Trump speaks during the first stop of his post-election tour last week in Cincinnati. (John Minchillo/AP)

President-elect Donald Trump ventured out Saturday night to attend a “Heroes and Villains”-themed costume party dressed as … himself.

The Long Island gathering was hosted by the Mercer family, among Trump’s biggest donors, and attended by some of his top aides, including former campaign manager Kellyanne Conway, who appeared as Superwoman.

Billionaire hedge fund magnate Robert Mercer and his wife pumped millions into a pro-Trump super PAC run by their daughter, Rebekah Mercer, who emerged this year as a highly influential player in Trump’s orbit.

Trump arrived at the family’s estate shortly after 8:30 p.m., according to a pool report, wearing a dark suit, an overcoat and a checkered tie. Asked whom he was dressed as, Trump pointed at himself and mouthed “me.”

He ignored other questions shouted at him by reporters, including some about his phone conversation Friday with the president of Taiwan, a move that broke with decades of U.S. policy toward China.

Neither Trump’s wife nor other family members attended the annual party, according to an aide, but Stephen K. Bannon, his White House counsel, was among those on hand. Both Conway and Bannon previously worked for Mercer-funded enterprises, and Rebekah Mercer urged their hiring by Trump.

Staff and security at the event were reportedly dressed as Hells Angels and retro Salvation Army members. Entertainment was provided by a cover band that churned out hits by the likes of Cher, Lady Gaga and Tina Turner.

Trump was back home at Trump Tower in time to catch some of “Saturday Night Live” and gave a thumbs-down to actor Alec Baldwin's impersonation of him. The opening skit poked fun at the president-elect's constant use of Twitter.

“Just tried watching Saturday Night Live — unwatchable!” Trump wrote on Twitter. “Totally biased, not funny and the Baldwin impersonation just can't get any worse. Sad”

Trump was back on Twitter before 7 a.m. Sunday, unleashing tweets about his plans to punish U.S. businesses that move their operations overseas.

“There will be a tax on our soon to be strong border of 35% for these companies,” Trump vowed.