claim: Doug Petrie played "Professor Normal" in Dr. Horrible's Sing-Along Blog.
evidence: Andrea Renzullo -LRB- born 2 March 1996 in Sundern , North Rhine-Westphalia -RRB- is a German singer and was a participant who finished fourth in season 4 of Das Supertalent .. Sundern. Sundern. North Rhine-Westphalia. North Rhine-Westphalia. German. Germany. season 4. Das Supertalent ( season 4 ). Das Supertalent. Das Supertalent