Fringe actor Seth Gabel, Farscape's Ben Browder and Torchwood's John Barrowman are among the sci-fi actors who have landed roles on The CW's superhero drama.
"A lot of that is just done for us," Kreisberg told SciFiNow. "I love Farscape, so I got to work with Ben Browder. I love Doctor Who and Torchwood, so I got to work with John Barrowman.
"[Exec producer] Greg Berlanti worked with Seth years ago on Dirty Sexy Money, so when the character of the Count came up, he was actually Greg's first choice and he's proven to be fantastic."
Kreisberg added that it is "fandom on our part" that "more than anything" leads Arrow to cast these familiar faces.
"It sort of goes along with our philosophy about this show - we care very much about what the audience likes and what they don't like, [and] what will excite them," he explained.
"But we always start with, 'What's exciting us?' - [because] this is the kind of show that we would all be hyper fans of… if we weren't making it! So as long as we're making ourselves happy, we hope that the audience will be equally as enthusiastic."
Arrow returns to The CW in the US on January 16 and is back on Sky1 in the UK on January 21.
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Watch a promo for the return of Arrow below: