Board Thread:General Discussion/@comment-4542120-20140920160442/@comment-24058209-20140923115717

I like to think of it like so: Time in Dimension X moves much faster, we know this now...

It has taken them millions, if not billions of years to complete the mutagen... that's a really long time.. so they've been watching earth all this time preparing for the day when the mutagen would be complete. The other thing they tried, was to create April O Neil, they wanted to use her psychic powers to transfuse the earth into dimension X, remember, that was what the technodrome was going to do... It was like a reality altering thing - no mutagen (you could call it a bypass on the perfecting of the mutagen). When they failed to do that, they resumed planning their invasion and working on the mutagen...

Now once it was perfected, all they needed was to find the Lair... which how did they go about it? They told Shredder to hunt April and Irma down, force them to have to retreat to the lair. I'm guessing Irma contacted April to hang out or something, as that would certify Irma being with April when the Footbots attacked.

So yes, the plan has been drawn out extensively throughout time, but the Kraang have been trying to make progress towards their goal a multitude of times - as Kurtzman said, they've been testing the mutagen for centuries.