In the title sequences seen beginning in this season, as the principals sing the theme song into the microphone, Jake (Angus T. Jones) appears on the left (where Charlie used to stand), and Walden (Ashton Kutcher) rises in the middle behind the mic (as Jake did in past seasons). Also, the voices of the singers are changed slightly, apparently to match Jake's maturity and Walden's new character. (In the DVD extras, one commentator explains that Jake is now 'grown up', and Walden is the character that qualifies as 'Half Man' as the show continues with the same title as before.)