[QUOTE=Koxinga]
Not sure if it’s the same thing, but the HBO series Rome portrayed the legions at Philippi as lining up almost like a sword and shield-bearing assembly line: you would stand with your hand on the shoulder of the guy in front of you, he’d gradually make his way to the front, fight a bit, then fall back and it’d be your turn. Is that what you’re talking about?
[/QUOTE]
Not really. That part is probably good, to some extent. The Romans almost certainly did employ some form of line rotation for the troops to keep the front line guys from getting worn out. It also portrays nicely how the legions worked by discipline and coordination, in formation, and not by individual soldiers breaking the line and going all banzai on the closest guy’s ass, like in some other on-screen portrayals (*Gladiator *- I’m looking at you). However, I was referring to the scene in Spartacus towards the end where you can see the legion lining up from above, from Spartacus’ vantage point on a hill, and there’s some bizarre tactical deployment going on. In the Philippi scene in Rome, you don’t really get a good look at any large scale tactical maneuvers (for good reason, I guess, as the directors probably didn’t know what they would have looked like), and it’s all wonky camera angles and whacky cuts. You can’t really tell for sure to what extent they’re using a “checkerboard” manipular formation or a more solid line. When the lines approach each other it does look like they have gaps of some sort left open in the formation, though. One thing that is missing in both *Spartacus *and Rome, in any event, is the legionaries throwing their *pila * (javelins) at each other before the lines clash, as well as other forms of missile bombardment that would probably have preceded the battle.
The Philippi scene is a damned cool battle scene, though. 
If you’re wondering why I keep going on about those gaps, there’s basically a debate going on about Roman infantry tactics, about whether the legions would fight in a formation composed of separate “squares” with blocks of soldiers, or in a more dense formation or a solid line, and also about how much space would be left between the individual soldiers, etc.
Some discussion.
Wiki on Roman tactics.
Now, if the real nerds show up, we can probably get a discussion going about the accuracy of the armor and equipment, the haircuts, and what have you. 