<P> Gus Pfender (Steve Kazee) is a recurring character in season 5 . Gus is a bass guitarist for an indie rock band . Fiona meets him while working in the diner . They marry on an impulse . Gus goes on tour without Fiona because she has cheated on him with Jimmy . When he returns, Fiona has already moved on with Sean, infuriating him . When Fiona attempts to apologise and remain friends by going to his gig, he sings a humiliating song about her . To punish him, Fiona pawns his grandmother's engagement ring in order to get a mortgage to buy her home back . He returns some time later, asking for the ring and a divorce . Sean buys the ring back for him so they can finalise their divorce and he can propose to Fiona . </P> <P> Derek Delgado (Luca Oriel) is a recurring character in season 5 as Debbie's boyfriend . Derek is an aspiring mixed martial artist who fosters Debbie's passion for fighting . Derek claims he came third in a city championship . He is the father of Debbie's baby Francis (Franny). </P> <P> In season 6 he goes to live in Florida with his grandmother after finding out Debbie is pregnant, leaving her to be a single mother . At the end of Season 8, Derek returns and wants to share custody of Franny . </P> <P> Bianca Samson (Bojana Novakovic) is a recurring character in season 5 . She is a physician who examines Frank's gunshot wound . She is diagnosed with terminal pancreatic cancer and decides her whole medical career was for nothing . She starts a freewheeling relationship with Frank to get away from her parents who want Bianca to treat the cancer . She buys Frank a $10,100 bottle of Macallan whiskey' 39, which is destroyed while they make love on the train tracks . When Frank tries to get her medical treatment, she flees to Costa Rica . Frank wakes up to find Bianca missing only to learn that she has gone off to die . </P>

Who plays kevins mom in shameless season 8