TimeSplitters

"TimeSplitters is a series of first-person shooter video games created by Free Radical Design. As the title suggests, each game features a time travelling element which enables players to battle in a diverse number of locations set over the span of several centuries.

The look of the series is substantially more stylized than most modern first person shooters with character models and expressions emphasizing more cartoon-like qualities and comic book-inspired design. Many of the characters represent instantly recognizable parodies of established pop culture stereotypes (such as the aristocratic English explorer or the suave secret agent). Many aspects of the series also focus on often surreal and self-deprecating humour.

The main antagonist in each of the games are the TimeSplitters, a race of aliens who wreak havoc on humanity throughout time."

Source: Wikipedia, "TimeSplitters_(series)", available under the CC-BY-SA License.