Bio[]
A Visitor youth combat trainer known to The Visitors as "The Exterminator", Klaus taught Revoc (a kind of Visitors' martial arts) to the cadets in The Visitors Youth Corps. He also taught Mike Donovan's son Sean at school.
The teaching of Revoc includes a move called the Silent Strike, in which the attacker concentrates on his prey, and remains motionless until he strikes with sudden physical strength and deadly results.
Klaus taught to fight with no mercy, and when Donovan found his son at the Visitor Youth School, and kidnapped him from there. Klaus tracked them down to a house where he flattened two tires of Donovan's van before fighting him, and getting knocked into a ditch. They fought again on the street, but Donovan escaped. Klaus then used Sean, who deliberately came back to The Visitors, as a trap for Mike. Klaus attacked Donovan with a Laser Whip, but got killed when he connected his laser whip to a circuit board, frying himself to death.