“DEADPOOL 2”

***

(R, 1:59)

Real “Deadpool” fans know to stick around when the end credits come up, patiently sitting through the scrolling names of visual effects supervisors and lighting specialists. Stay. Stay until the ushers toss you out.

That’s because the “Deadpool” filmmakers aren’t content to contain their sprawling, anarchic and subversive hero in any conventional box. In the world of Deadpool, even the boring end credits are studded with jokes and teases.

So hold onto your seats as Ryan Reynolds once more dons the red suit and katana swords for “Deadpool 2,” a saucy, overstuffed and very entertaining sequel to the 2016 massive hit “Deadpool,” which became the second-highest grossing R-rated film domestically — after “The Passion of the Christ.” How do we know that? Deadpool happily brags about it in the new film, continuing his breaking-the-fourth-wall humor.

Just some of the other things that get derided this time are “Yentl,” ”Frozen,” ”Stranger Things,” Wolverine, Jared Kushner, cultural appropriation, Brad Pitt, the Norwegian band A-ha, “Basic Instinct,” ”Robocop,” fanny packs, “Say Anything,” dubstep, “Sharknado” and Reynolds himself, who mocks his disastrous earlier decision to play Green Lantern.

“Deadpool 2” is as gruesome and violent as the first, but perhaps the biggest victim is the very concept of superhero movies. Our anti-hero adores mocking the moral clarity, earnestness and predictable stunts of his distant cousins. And, as a Marvel property, he especially delights in lampooning D.C. Comics. “So dark,” Deadpool says to another superhero. “Are you sure you’re not from the DC Universe?”

In this film, which reunites the original writing team of Rhett Reese and Paul Warnick, we begin by finding our unkillable mercenary in the same domestic bliss where we left him. But if “Deadpool” was an origin story, “Deadpool 2” is a quest tale.

Our hero this time encounters the time traveling soldier Cable (Josh Brolin), a motley crew of mutants he calls X-Force — “Isn’t that a little derivative?” someone asks snarkily — and various superheroes and mutants, all set to a lively soundtrack that includes Air Supply, Peter Gabriel, “Annie” and an original song with filthy lyrics. If something can be oddly sweet while heads are being decapitated, it’s this film.

Some favorites from the first film are back — some only briefly — such as housemate Leslie Uggams, girlfriend Morena Baccarin and cab driver Karan Soni. The new characters don’t have time to make much of an impression, except for Zazie Beetz from “Atlanta” who has a great turn as Domino, a strong, sardonic superhero who relies on luck. (Someone please write her own film.)

Deadpool, of course, helps us along the film’s convoluted plot with such post-modern cracks as “Big CGI fight coming up!” or the put-down, “That’s just lazy writing” or, after a cool sequence, “Tell me they got that in slow motion.” Director David Leitch replaces Tim Miller but there’s been no noticeable change in tone or corrosion in the franchise’s terrific special effects.

If anything, the surprising success of the original has resulted in more money and more insane sequences, like a chase sequence with a truck convoy and a bizarre scene when Deadpool’s legs regrow after he is cut in half, giving him baby limbs for a time.

Reynolds is once again at his arch and nihilist best here, while acting and jumping in so much facial prosthetics that it makes him look like he’s inside melted cheese — or, as the first movie put it, an avocado that had relations with an older avocado.

To really appreciate “Deadpool 2” you have to have seen the original and probably every other Marvel superhero film, too. And be up on pop culture, from Cher to Broadway musicals. (It’s a good thing there’s no quiz at the end.) Speaking of ends, don’t embarrass yourself by getting up to leave when it seems to be over. And get ready to happily sit through “Deadpool 3,” too.