2.04 : Hero

An unlikely superhero with unprecedented strength and the ability to fly is intent on thwarting crime in the city, but his good deeds are interfering with the work of the Sanctuary. Magnus and Will manage to capture him, but when tests reveal that he does not possess the DNA of an Abnormal, they are baffled as to the origins of his powers. Kate risks the new-found trust she is developing with the team when she agrees to help her brother who is in trouble with a crime boss.

Source : Sanctuary Spoiler Zone