for the interstitials in place of the stars of Perfect Strangers. Dave Coulier, John Stamos and Mary-Kate and Ashley Olsen (alternating as Michelle Tanner) all appeared on the set of Full House introducing the season and series premieres that night. As they began their first segment, the TGIF name was officially introduced, in which its meaning, "Thank Goodness It's Funny", was re-emphasized from the theme lyrics. Coulier and Stamos also announced that a new policy, in which stars from the other three TGIF programs would rotate hosting responsibilities along with them on a week-to-week basis, would begin. Rotating with Full House that season were the casts of new arrival Family Matters, Perfect Strangers (whose first night its cast members hosted the Friday lineup under the TGIF banner occurred on October 13, 1989) and Just the Ten of Us. On the premiere night of TGIF, the new (and ultimately short-lived) comedy Free Spirit aired as a preview telecast at 9:30 p.m. Eastern Time, with Just the Ten of Us reclaiming its time slot the following week. During the inaugural season of the format, the TGIF logo was only featured at the start of every hosted segment, appearing in a design where each letter was encased in a tall gray box (as pictured to the right); the boxes would flip in at the bottom of the screen, stand still for a few seconds, and then turn out. One of the animated mice from the TGIF title sequences was featured on some weeks within the live-action host segments, and was introduced by the actors as the lineup's mascot, known as "Friday the Mouse". Custom bumpers would appear after the final scene of each program, where normally a short cut of the show's title logo and theme would play, denoting the final commercial break. During the first season of TGIF, the bumpers featured additional animations of the mice, including variants that featured the taller mouse popping out of the grandfather clock, a small mouse being dragged around by a running chainsaw around it, the taller mouse walking towards the grandfather clock, thinking it over, and then backtracking, and the taller mouse popping up from the top and bottom of the screen on both sides of the show's title logo. The official title logo for the respective program (as opposed to the logo designs used mainly in network promotions for each show that were used