In syndication, the episodes were edited from 23-24 minutes to 21-22 minutes. The episodes on Shout! Factory's DVD releases are the original full-length versions.
Originally, the show had 5 different opening sequences: The version seen on the pilot episode, the version from seasons 1 & 2 (1985-1986), the version from season 3 (1986-1987), the version from seasons 4 & 5 (1987-1989), and the version from season 6 (1989-1990). In syndication, a truncated version of the season 4 & 5 opening was used on every season, except for season 6. However, Shout! Factory's DVD releases, have the proper openings reinstated depending on the episodes/seasons.