Lau'Tan

Lucas Finch was a Gizou assassin posing as the Krillitane Brother Lassar. Using Lassar's human alias "Lucas Finch", he served as prosecutor when the Doctor was put on trial by the Shadow Proclamation. However, it was later revealed that "Finch" was a Gizou in disguise and was arrested by the Proclamation. Whether this means the actual Lassar survived the explosion or not remains to be seen. (IDW: Fugitive)