Lab Assistants are Dr. Neo Cortex's henchmen that Crash Bandicoot encounters throughout the Crash Bandicoot series. The lab assistants are used as minions who try and stop Crash from foiling Cortex's plans. They appear throughout the Crash Bandicoot series disguised in different outfits and costumes that usually correspond with the theme of a level (except in Crash Bandicoot where they always have their scientist-themed look on). They also have their own methods of attacking Crash depending on their disguise. The most prominent features of the Lab Assistants are their glasses and lanky frame, both of which appear on all forms of lab assistants that Crash may encounter in the game.
Later in Crash Bandicoot 3: Warped, a secret room in the central hub displays how the lab assistants are mass produced and sent into different time periods. This suggests that the Lab Assistants are actually robots created by Cortex to serve as henchmen. When Crash destroys Cortex's time traveling machine though, Cortex lost a line of his production of Lab Assistants. However, in Crash Bandicoot: The Wrath of Cortex, Cortex is seen again with more Lab Assistants, implying that Cortex may have more than one way of creating Lab Assistants.