Destroy All Humans!

Story related and cannot be missed.

This will pop on Mission 12 - Whatever Happened to Crypto 136, once you have control over Crypto

Here is my 100% Achievement guide and full walkthrough so you don't miss a thing.

Sorry related so therefore cannot be missed.

This unlocks as soon as you begin Level 12 (Whatever Happened to Crypto 136)

Go to 1:45:00 in my part 1 video to see where and how to unlock this and to see the level.

Hope this helps!

Part 1

Part 2