Now we’re cookin’ with phased plasma! The first season of B5 opens with “Midnight on the Firing Line,” which moves like a Ferrari compared to “The Gathering.” (Totally a Volvo: dependable and robust, yet slightly lacking in the zero-to-60s.) What do we think of the new faces? Are Ivanova and Winters a step forward or backward? Meanwhile, in spoiler territory, someone puts on his grumpy face over his co-hosts’ assessment of Commander Sinclair.