"I was awakened at a little past 7:00 a.m. by my ringing cell phone. I got out of bed to answer and discovered I'd already missed two calls from my sister in Montreal. What the hell? I answered. She asked me if I had the TV on. I told her I just got up. She informed me that two planes had flown into the Twin Towers. Another had hit the Pentagon. I was stunned. For a split second, my sci-fi mind assumed some mass mechanical failure, but the truth, far more insidious and disquieting took hold. I turned on the TV and immediately phoned Paul. 'You watching?' I asked. 'Yeah,' he said. 'I'm watching.'
"When I got in to work, the Production Offices were quiet. Someone had turned on the TV in the conference room (reserved for screening visual effects) and anyone who wasn't on filming was in there, silently watching the horrific events unfold. It was surreal. Down on set, we were finishing up second unit on this episode while main unit photography had started on 'Menace.' 9/11 is the first thing that comes to mind when I think back to either of these episodes."
(Writer/producer Joseph Mallozzi, in a post at his blog)