In no particular order of preference...
1. A scene of each starship captain from a major faction sitting in a chair and commanding/overseeing their bridge and vessel - or actively giving orders.
<Yam. Taisa> "Code red, all units scramble and take off. That is an order."
<Nep. Captain> "Starboard torpedoes, FIRE! Marines, watch your flanks!"
<NMX Superior Commander> "We're in position. On my signal, we raise hell."
<Ind. Luca> "Keep cruising on autopilot and suit up, we'll find out what it is once we get to it."
2. GUNS! A wall of them or a line of characters from different factions firing their choice armaments. (unpowered characters wielding power armour weapons and firing them)
3. Nepleslian marines taking time off and relaxing with cohorts.
4. A Nepleslian pub brawl.
5. The International Relations Conference, a-la Uso's suggestion.
6.
"Alright, they're bringing the fight to us! I can work with this!"