The Holobob is a mental ability featured in Destroy All Humans!.
The Holobob is an ability that lets Crypto project an illusion of a human around himself, assuming his or her identity. It's general appearance is a hologram-like disguise of the person Crypto is imitating.
Holobob allows Crypto to walk around an area without creating suspicion and/or alerting the authorities (unless Psychokinesis is used in front of humans/enemies). However the disguise uses concentration energy, forcing him to continually use Cortex Scan to take the thoughts from other humans to refill his concentration meter. In addition Majestic agents are able to see through the illusion and instantly identify Crypto. When this happens, the disguise will flash red and disappear, unless Crypto avoids the Majestic agents.