 When the discussion came to inserting the DS9 crew into the bar @-@ brawl scene , Berman liked the idea but was unsure if it could actually be done . Visual effects supervisor Gary Hutzel created test footage and screened it for Behr and Moore , who thought that it was simply footage from the original episode . Once Hutzel revealed that an additional security officer had been seamlessly added to the sequence , the episode was green @-@ lit . During the <unk> process , " The Trouble with Tribbles " was regularly consulted , so the writers could decide where to insert characters . The Temporal Agents , <unk> and <unk> , were so named as they were <unk> of Mulder and Scully from The X @-@ Files . 
