 Charlie Brill returned to film new scenes as Klingon agent Arne Darvin , while original series writer Gerrold was allowed to appear as an extra in two scenes as a crewman from the Enterprise . In one of those scenes he was holding an original tribble from " The Trouble with Tribbles " . Walter Koenig was on hand as well during the filming of the episode to teach the DS9 actors how the consoles were operated on the Enterprise . Koenig later commented that he was paid eight times as much for this and the residual payment as he had been for the original episode . A string of other visitors came to the set during filming , including Majel Barrett and former The Next Generation producer ( and TOS co @-@ producer ) Bob Justman . 
 Charlie Brill returned to film new scenes as Klingon agent Arne Darvin , while original series writer Gerrold was allowed to appear as an extra in two scenes as a crewman from the Enterprise . In one of those scenes he was holding an original tribble from " The Trouble with Tribbles " . Walter Koenig was on hand as well during the filming of the episode to teach the DS9 actors how the consoles <a href='uninflect' title='1'><mark>were</mark></a> operated on the Enterprise . Koenig later commented that he was paid eight times as much for this and the residual payment as he had been for the original episode . A string of other visitors came to the set during filming , including Majel Barrett and former The Next Generation producer ( and TOS <a href='uninflect' title='2'><mark>co</mark></a> @-@ producer ) Bob Justman . 
Charlie Brill returned to film new scenes as Klingon agent Arne Darvin , while original series writer Gerrold was allowed to appear as an extra in two scenes as a crewman from da Enterprise . In one of those scenes he was holding an original tribble from " TdaTrouble with Tribbles " . Walter Koenig was on hand as well during thdailming of the episode to teach theda9 actors how the consoles was operated on the Enterprise . Koenig later commented that he was paid eight times as much fa this and the residual payment as he had been for the daginal episode . A string of other visitors came to the set durin filming , including Majel Barrett and former The nxt Generation producer ( and TOS coed @-@ producer ) Bob Justman .