The hunky actors' banter is all in good fun to encourage people to donate $10 to the Star Trek Omaze campaign, which benefits several charities, including Make-A-Wish and West Africa's Heaven Homes.
When Pine announces that the winner may get to sit in the "captain's chair," Elba pushes in front of him to reveal, "Not to blow the plot, but I'm the new Captain Kirk. Did you not know that?" (In reality, Elba's villainous role is still under wraps.)
In the end, Pine walks out of the shot and sneers, "You're so much shorter than I thought you were."
Elba shoots back, "That's not what your girlfriend said, bro!"
Star Trek Beyond, directed by Justin Lin, is set for release next summer.