US stand-up comedian Dave Chappelle was attacked on stage on Tuesday during a performance at the Hollywood Bowl in Los Angeles.
Clips shared on social media showed someone running into the star.
Further videos appeared to show the comic apparently unharmed after returning to the stage at the Netflix Is A Joke Festival.
Chappelle faced criticism and protests last year when his Netflix special was accused of being transphobic.
After returning to the stage on Tuesday, the 48-year-old joked: "It was a trans man."
According to ABC journalist Stephanie Wash, fellow comic Chris Rock - who was slapped on stage by Will Smith at the Oscars in March - then came on stage with Chappelle.
US-based British journalist Sharon Carpenter said actor and singer Jamie Foxx also joined Chappelle.
Chappelle thanks friends
In another video, Chappelle could be seen thanking his famous friends for helping out, saying: "Whenever you're in trouble, Jamie Foxx will show up in a sheriff's hat."
"I thought that was part of the show," Foxx responded.
Chappelle joked: "I've been doing this 35 years. I just stomped a [person] backstage. I've always wanted to do that."
Jimmy Carr, the British comedian who sparked outrage earlier this year for a routine about the Holocaust in his own Netflix stand-up special, also performed at the streaming giant's event on Tuesday.
He tweeted afterwards to say the show was "crazy" and he was "just happy everyone's OK".
A spokeswoman for the Hollywood Bowl said an investigation has been launched, telling the PA news agency: "The incident that occurred at the Hollywood Bowl on May 3 2022 is an active investigation and we are unable to comment further at this time."
In October, about 100 people protested outside Netflix's headquarters over the airing of a comedy special by Chappelle, which they said was transphobic.
They had objected to The Closer, in which he said "gender is a fact" and that LGBT people were "too sensitive".
