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The Season 3 finale of “The Blacklist” dropped several bombshells — Liz (Megan Boone) is alive, baby Agnes is missing and Alexander Kirk (Ulrich Thomsen) is Liz’s father. But if you think the show is going to ease off when it returns, creator Jon Bokenkamp tells Zap2it that Season 4 definitely isn’t going to let up on the gas.

RELATED: ‘The Blacklist’ drops a Tom Keen bombshell, sets up a killer spinoff idea

Here are four things to know about the upcoming season and the spinoff involving Tom (Ryan Eggold).

Season 4 picks up right where Season 3 left off

“We pick up in the immediate aftermath of where we left off in Season 3, and it’s an absolute roller coaster,” says Bokenkamp. “It’s a mess. It’s frenetic and dangerous and the stakes are incredibly high. Our task force has been fractured in this very strange way and Liz Keen is alive and coming back into the world and there are going to be incredible stories to tell, not only with her and Red but with the rest of the team and how they move forward.”

He adds, “We’re really on a freight train of storytelling. This season is similar [to Season 3] in that we’re starting in such a really nice place, story-wise, with some great energy. I think it’s going to be a really fun season, I think people are going to love it.”

Alexander Kirk is a major player

the blacklist season 3 ulrich thomsen The Blacklist: 4 things to know about Season 4 & its spinoff

“That was a huge cliffhanger for us — Alexander Kirk was revealed to be Liz’s father. He is back [in Season 4],” says Bokenkamp. “Ulrich is incredible, I’m seeing dailies just now of the first couple episodes — he’s fantastic, he’s got great chemistry with Megan and James. I think that character and that storyline are going to be, I hope, really surprising and really refreshing for people. I think it’s going to be a really great story.”

Mr. Kaplan is also coming back

the blacklist season 3 james spader susan blommaert The Blacklist: 4 things to know about Season 4 & its spinoff

“Like Liz and Tom, Mr. Kaplan (Susan Blommaert) betrayed Red and I think we have been very clear since the beginning of the show that he has a very specific moral code. How he handles this betrayal is a big story for us to tell and we’re going to dive right into that. That’s something that comes up very early in the season. That incredibly deep betrayal to Reddington is going to chew up quite a bit of scenery.”

Tom is not moving into his own show just yet

“The spinoff is a midseason show, so it doesn’t begin until next year. And we have a lot of story to tell on ‘The Blacklist,'” says Bokenkamp. “Tom will continue to be part of the show for the foreseeable future and his story with Liz about what to do with this child that’s missing and this man that’s entered their lives and the betrayal with Reddington, we have a lot of story that we owe the audience some resolution on before we move on to the spinoff.

“We’re still working on the spinoff and how that will all work, but we’re still in full-on ‘Blacklist’ mode trying to juggle the various problems that we’ve created for ourselves and that’s going to be at the forefront when we come back.”

“The Blacklist” returns Thursday, Sept. 22 at 10 p.m. ET/PT on NBC.