Premise: Tom Clancy's Splinter Cell is a 2002 stealth video game developed by Ubi Soft Montreal and built on the Unreal Engine 2. It is the first "Splinter Cell" game in the series. Endorsed by author Tom Clancy, it follows the activities of NSA black ops agent Sam Fisher. The character of Fisher is voiced by actor Michael Ironside.
Hypothesis: There were no other Splinter Cell games after 2002.