Here is my idea for a time travel story.
A secret cell of bad guys, ummm lets say hold outs from the NTF are developing a time machine. You, as being SOC, have to stop them before the get the thing online. So you are hunting them down, find the machine, big battle ensues. You don't stop them in time from using the machine :doh: , but you secure the facility. Command learns from the captured personnel of their ultimate plans. Which are to go back to Ross 128 and Defeat the Shivans, thus stopping the GTVA from ever being formed, upgrading the GTA with shields, beams, weps, new fighters, etc. Then help the GTA crush the PVN and eradicate the fish lovin' Vasudans. Now you are apart of a task force to stop these crazy fools and restore the time line. Feel free to use it if you want.