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

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Dec 17, 2012, 4:24 PM EST

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)