The debut serial of the Sixth Doctor introduced a new and more colourful rendition of the starfield-themed title sequence by Sid Sutton, which featured the Sixth's Doctor's face appearing in a flash of rainbow streaks and changing from a smile to a large grin (the first time a Doctor's face was shown to change facial expressions during the title sequence), as well as a slightly redesigned version of the show's neon tube-stylised logo, now more curved in an upward arc and with the addition of blue, indigo and purple highlights. Both the new title sequence and logo remained in use to the end of Season 23.