This section of the guide to Destroy All Humans explains how to extend the alternative version of our character.
Holoform is a useful skill that you gain at the beginning of the game. It enables you to move freely among humans. You won't be noticed, so people won't panic.
But you have to be careful. The holoform disappears in time. You have to constantly renew it to stay in a particular body.
To prolong the time the holoform works, you need to upgrade the Cortex Scan.
Effect: extends the duration of holoform if you scan new thoughts
Cost: 250 DNA points
Effect: extends the duration of holoform after scanning a civilian
Cost: 500 DNA points
Effect: extends the duration of Holobob after scanning a soldier
Cost: 750 DNA points