Mo starts to organise a welcome home party for Kat and invites some of the residents of Albert Square. Little Mo is worried as both Alfie and Billy will be invited. At the party, public opinion is that Alfie and Kat would still be the perfect couple and Billy and Little Mo should get back together. Sam returns to find the lock on her door changed. When Chrissie fills her in on the break-in and gives her the new keys, Sam is worried about what Chrissie may have found while tidying up.