Then there was the time Scott Bakula signed John Barrowman's ass

What happens when Doctor Who and Torchwood's Captain Jack Harkness himself—actor John Barrowman—meets up with Star Trek's Captain Jonathan Archer—actor Scott Bakula? Let's just say that things get a little ... cheeky.

In a mindblowing moment at the Five Captains panel at Destination Star Trek in London this weekend, actor Scott Bakula got to autograph John Barrowman's bare naked butt under the watchful, if somewhat bemused, eyes of Captain James T. Kirk himself, William Shatner, as you can see above.

The rest of the panel was made up of Sir Patrick Stewart, Avery Brooks and Kate Mulgrew.

In other news, we learned that Sir Patrick Stewart's favorite sci-fi is Aliens, Kate Mulgrew's is the TV series Continuum and the Shat's is "the film with blue people" (Avatar).

We guess John Barrowman's favorite sci-fi is? Considering the pic, maybe Star Trek: Enterprise? Just a wild guess we're throwing out there. And wonder what Scott Bakula's favorite sci-fi is ... Doctor Who, or Torchwood?

(Team Barrowman via SFX)

Related Stories

Report: William Shatner working on official biography of Leonard Nimoy Nathalie Caron

The late Leonard Nimoy will get to "live long and prosper" thanks to the mind-melding pen of his BFF William Shatner.

Doctor Who looks at Missy and Osgood in new clip leading up to Season 9 Carol Pinchefsky

Doctor Who’s Missy is a force to be reckoned with ... and hey, didn't Osgood die in S8?

Check out the pilot for fan series Star Trek: Renegades Carol Pinchefsky

Fan films are sophisticated enough that they now rival television shows in terms of acting talent and special effects.