Anze Kopitar had an assist to break a tie with Wayne Gretzky for second place in Kings history. Kopitar has 673 assists in 1,160 games for Los Angeles; Gretzky had 672 in 539 games. Marcel Dionne is first with 757.
Vegas led 3-1 after the first period, with all four goals scored in a span of 1:16. Reilly Smith had a power-play goal at 9:53 of the first period, and Keegan Kolesar made it 2-0 at 10:19.
Kings forward Adrian Kempe cut it to 2-1 at 10:32. Kopitar had the secondary assist on Kempe's team-leading 13th goal to pass Gretzky.
"I think we gave up too many odd-man rushes, in the first period especially, and that's on everybody, forwards and 'D.' We've got to be more responsible," Kempe said. "Last time we played Vegas at home, we did all those details really good and we were on point for 60 minutes. Tonight, we weren't really there in the beginning and it cost us a couple goals."
Marchessault made it 3-1 at 11:09, scoring off the rebound after William Karlsson's pass hit the post.
"Yeah, that was pretty crazy," Golden Knights defenseman Ben Hutton. "I mean, not every time you're watching or playing a game there's that many goals that quick. So that was good to see a couple of the boys bury a couple goals. That was fun."
Stephenson scored on the power play for a 4-1 lead 1:21 into the second period, and Quick was replaced by Garret Sparks after Mattias Janmark made it 5-1 at 2:47.