Storyline
Scientist William Spade is very close to completing a fully functional time machine, but has little time to celebrate when four members of a race of time-worshipping demons known as the Takar pay him a visit. Staine, the Dreg, the Surgeon, and the Butcher torture Spade within an inch of his life after he refuses to surrender the time machine before its completion. After losing both arms and his left eye, Spade manages to activate the time machine with his nose sending the Takar back to where they came from, but causes a huge rip in the timestream in the process due to prematurely activating the machine.
As a result, combatants from unique time periods are zapped randomly from place to place, each with their own reason to fight - none of them knowing where they will go next. Spade rebuilds his body and becomes Portal and is now more than ready to defend himself from anyone who might be warped to his plane of existence—including the Takar.
Read more about this topic: Timeslaughter