Honestly stargate feels like a natural fit for Pulp Alley. Been a while since I watched but IIRC there is pretty much always some macguffin that needs to be activated, de-activated, rigged, spoofed, rescued or what have you during an intense firefight around the gate. PA would be perfect for that. The rules are more narrative focused and the pulp leagues book with specific weapon rules might be good if you prefer that over the all round "shoot" stat, the vehicles book would be a must if you have death gliders or anything like that. But even with just the core book it would be a blast, to the point I'm thinking of what 15mm stuff I might rig up to play this myself!