If we re-call all the TOS enemies that Kirk & Crew encountered - they were all defeated within 1-2 episodes with almost no implication of complete doom for Earth/Starfleet otherwise.
A bit of team work, use of wits, blue phaser beams or even some kirk-fu subdued any threat, land or in space.
In this alternative timeline, what could possibly give the mysterious TOS era villain such chops to be a bigger threat than the future Romulan Nero posed?
And why wasn't such a villain, device, power not encountered and threatened Earth in the original TOS time line?
A bit of team work, use of wits, blue phaser beams or even some kirk-fu subdued any threat, land or in space.
In this alternative timeline, what could possibly give the mysterious TOS era villain such chops to be a bigger threat than the future Romulan Nero posed?
And why wasn't such a villain, device, power not encountered and threatened Earth in the original TOS time line?
- because that 'WMD' would have existed in the original timeline, any 'evil' character from TOS would have gotten hold of it and tried to cause trouble, the alternative time line angle is not needed to justify its existence.