The "them" in question refers to the group that Stallone's character belongs to in the second installment of Marvel's interstellar series.

[Warning: spoilers for Guardians of the Galaxy Vol. 2 ahead.]

In the movie, Stallone plays Stakar, AKA Starhawk — one of the original comic book Guardians. A mid-credit sequence scenes introduces the other members of that team, including Ving Rhames' Charlie-27 and Michelle Yeoh's Aleta Ogord.

Gunn said that while he's not committed to Guardians past the third movie — "basically, the story of this group ends with Vol. 3," he explained — he is already planning future Marvel movies.

"I'm helping to decide what projects we'll be pursuing outside of Guardians of the Galaxy Vol. 3 and what the next cosmic characters we will focus on," he told the Sun. "It's my plan to have Sly — and I talked to him last night — to find a place for him in the future of the Marvel Universe."

Guardians of the Galaxy Vol. 2 opens in U.S. theaters May 5.