And Tracy makes three.

A mere 33 years after the premiere of Twins, director Ivan Reitman has developed a sequel. Tracy Morgan (30 Rock) joins the unlikely pair of Julian (Arnold Schwarzenegger) and Vincent (Danny DeVito) when they find they are part of a trio. Triplets will shoot January in Boston for a late 2022 or 2023 release.

In the original, the two brothers are created as a secret experiment carried out at a genetics laboratory. Julian finds out he has a twin and seeks him out, only to find that his brother is as unlike him as it is possible to be. (Hijinks thus ensue.)

Director Reitman talked to Deadline about the plot of the sequel, saying, “secretly, there was a third baby born, a Black baby, who hasn’t been in touch with his siblings,” Reitman shared. “They don’t know each other and very early in the movie they meet and it’s how they achieve a bond together after all these years. It’s really a film about family and, no matter how different we all are, we have to learn to get along. These guys have great chemistry together, and you can see that in the reel, and how much energy they bring out in each other.”

The original was a success for Universal, with a $216 million global take, but a sequel just never happened. Reitman said that the studio terms called for a reversion of rights if the sequel wasn’t made in a certain amount of time. “In terms of future rights, Universal had very restrictive secondary rights in terms of sequels. They had to act on it very quickly, which they didn’t, because we hadn’t really developed it.”

When he finally got the opportunity to make the follow-up movie, the original idea was to cast Eddie Murphy in the sequel, but scheduling problems made that impossible.

Reitman said after Schwarzenegger and Murphy met, “it was, ‘I should be a triplet, that could be a very funny comedy.’ We started a script with Eddie, and after the success he had with Amazon Prime on Coming 2 America, he got himself booked up heavily.” (Beverly Hills Cop 4 is an upcoming project.)

“And we knew we were going to make it at the beginning of next year. I’d been good friends with Tracy Morgan for a long time and always thought he was one of the funniest men in the world. I thought he would make a terrific triplet, and we rewrote the whole script for him. Now, we’ll go out and try and put the money together and get it made.”

Reitman has been busy producing a reboot of his comedy classic Ghostbusters that son Jason Reitman is directing, (Sony’s Ghostbusters: Afterlife bows November 19,) but said he was eager to get back behind the camera and recreate what he said was a most pleasant experience.

“I haven’t directed in a couple years, but Arnold kept saying, ‘c’mon, we had such a great time.’ I just called him in Budapest and he’s so excited to see how people respond to the reel as we send it out. The initial reaction has been very strong, and how young Arnold and Danny look and how great the chemistry is with Tracy. I had a great time doing the first one, and this is going to be fun.”