 The 2006 "enhanced" version of the series, aside from replacing original  footage with newly made graphics, also standardized the opening credits of  all episodes. A new version of the original theme music was recorded and  replaced the original recordings. As a result, the "opera singer", who  previously was only heard in the opening credits of seasons 2 and 3 is now  heard on season 1 episodes as well. Like most other aspects of the "enhanced"  Star Trek, this change has been controversial with some fans.