Wagner (School Reunion)

Mr Wagner was one of Mr Finch's Krillitanes who took over the Deffry Vale High School in order solve the Skasis Paradigm and become "gods". All the Krillitanes were destroyed when K-9 blew up a can of their oil. (DW: School Reunion)

He is unique in the fact his true Krillitane form is grey. He is the only one known to have this look.

Behind the Scenes
In a deleted scene, Mr Wagner became a vegetarian because when Mrs Jackson offered him a rat he claimed to have turned organic.