From The TimeSplitters Wiki

Khallos
Unlocked by	TS2: Beat Atom Smasher on Normal TSFP: Default
Species	Human
Size	Normal
Accuracy	6
Agility	TS2:6 TSFP:5
Stamina	TS2:6 TSFP:5
Fire Proof	5
Shock Proof	5
Default AI	TS2:4 TSFP:2
Native TimeZone	1969-1972
First Appearance	TS2 Story Mode
Relations	N/A
Games	TS2, TSFP

TS1 Gesture	N/A	TSFP Gesture	Jumps up and pets Strudel and says "Me and my pussy are going to have a lot of fun."
TS2 Gallery	It's not easy holding the world to ransom but Mr. Khallos seems well qualified for the job. He's got secret bases, doomsday devices, scores of henchmen and a penchant for over elaborate death scenes. He poo-poos his detractors who claim that he got his eye patch from a novelty store and that his first name is Archibald.	TSFP Gallery	Or Archibald Granville Khallos as he’d rather you didn’t know. Still, it looks like his plans for taking over the world are still swinging along.

Khallos is Harry Tipper's archnemesis and is largely based on Ernst Stavro Blofeld, the recurring head of the criminal organisation "SPECTRE" in James Bond books and films. This is a fitting choice to base him on since most of the team behind TimeSplitters also worked on Goldeneye 007 for the Nintendo 64. Khallos has appeared in both TS2 and TSFP as Harry's rival.

According to TS2 Arcade League Khallos owns the Arcade level Hangar.

1969 Russian Connection/Khallos Express

In TimeSplitters: Future Perfect Crow has combined forces with Khallos in what is chronologically the first encounter with him. Khallos is attempting to start World War 3 by launching a nuclear missile from his base. He has kidnapped Harry Tipper's girlfriend Kitten Celeste in an attempt to keep Tipper off his back. Cortez and Tipper eventually catch up with Khallos and put an end to his plans and rescue Kitten, just in the nick of time.

1972 Atom Smasher

In TimeSplitters 2 Khallos was up to his old tricks again, researching sub-atomic particles in his secret island base. He had captured Harry Tipper and set up a laser to kill him, however Tipper escaped again and Khallos, rather than be brought to justice, started the self-destruction sequence. Tipper managed to deactivate the bombs and destroy Khallos' Atom Smasher.

Strudel

Read about Strudel at his page.