It was the first period heard round the NHL.

The Rangers, skating on the second night of a back-to-back, scored six goals within the first 13:36 of the game en route to a 7-0 demolition of the Predators on Sunday night at Madison Square Garden.

They hung six on the Penguins through two periods the night before, but needed less than 20 minutes in a single frame this time around to match that scoring onslaught.

On Saturday, it was Igor Shesterkin blanking Pittsburgh.

On Sunday, it was Jaroslav Halak shutting out Nashville with 22 saves.

When Vladimir Tarasenko and Patrick Kane first pulled on Rangers jerseys, this is the kind of offensive output that head coach Gerard Gallant envisioned for his team.

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“I mean, it’s really coming together the last couple games,” Gallant said after the win, which kept the Rangers within five points of the Devils as their cross-Hudson rival defeated the Lightning on Sunday night. “What I liked about tonight a lot more than the other night is that we didn’t give up many scoring chances. Jaro had to make some great saves in the first period and then a couple other saves over the next two periods.

“I thought he did a great job in the first and after that, I thought we really shut it down and played the game the right way.”

The goals came at a rapid-fire pace for the Rangers, who have now outscored opponents 13-0 in their last two games.

Shot after shot. Goal after goal. Win after win.

The Rangers’ six goals in the opening frame tied the franchise record for the most in a first period. The last time the club put on that kind of show was Dec. 15, 1999 against the Kings.

And, boy, was it a performance you couldn’t take your eyes off.

Filip Chytil was the opening act.

Snapping an 18-game scoring drought, Chytil took the puck right down Broadway, turned Predators defenseman Dante Fabbro inside out and then buried it for the 1-0 lead.

The Czech center was so caught up in the play he ended up in Nashville’s net himself, but emerged with a smile on his face.

“It felt good,” Chytil said. “Finally, after a long time. Sometimes you have stretches like that in the season. It’s long. Feels good now, hopefully it’s going to continue.”

Mika Zibanejad and Tyler Motte each scored off one-timers to inflate the Rangers lead to 2-0 and 3-0, respectively.

During four-on-four play later in the period, K’Andre Miller recorded the first of his two goals and the second of his four points on the night.

Taking a feed from Vincent Trocheck, the defenseman buried the puck on the two-on-one rush.

The hook came out for Predators netminder Kevin Lankinen after that one.

Juuse Saros entered in relief, but it didn’t slow things down for Nashville.

Lankinen, who finished with a single save, became the second goalie the Rangers ran off the ice in as many games following Pittsburgh’s Tristan Jarry one night earlier.

All six scores came on consecutive shots.

One after the other.

The Predators may have been without key players Roman Josi, Ryan McDonagh, Filip Forsberg and Ryan Johansen, but that many goals are difficult to keep up with no matter what.

“Create good habits,” Zibanejad said of how the Rangers approached the rest of the game. “Not put ourselves in a bad spot and try to keep playing the same way. Obviously, we don’t think we’re going to score another six in the second. Just in general, I think [it was] a really good weekend, really good games, [Saturday and Sunday], good week overall.”

Dating back to the 4-2 win over Pittsburgh on Thursday, the Rangers have scored 15 unanswered goals, the most consecutive goals by an NHL team this season.

They are just the sixth team in NHL history to earn back-to-back shutouts while scoring six or more goals.

The Rangers’ revamped lineup was already one for the history books, but now they have the stats to back it up.

Everything has been going in for them the last two games.

These are the contests from which unwavering confidence is born.