Jon (played by Jon Lee) is a protagonist in Seeing Double.
Real member of S Club who gets captured by the scientist's goons and learns the truth about the clones from his groupmates. Bradley (played by Bradley McIntosh) appears in Seeing Double.
Real member of S Club who helps investigate the scientist's lair and reveals the clones' true origins to his groupmates. Hannah (played by Hannah Spearritt) appears in Seeing Double.
Real member of S Club who gets captured alongside her bandmates and ultimately helps defeat the evil scientist. Tina (played by Tina Barrett) appears in Seeing Double.
Real member of S Club who gets captured by the scientist's goons and helps save her bandmates from the self-destructing facility. Rachel (played by Rachel Stevens) appears in Seeing Double.
Real member of S Club who attempts to warn a fan about the clones but gets captured, later joining her bandmates to stop the villain. Victor (played by David Gant) appears in Seeing Double.
Evil scientist and former genetics professor who creates clones of the pop group to take over the world through music. Susan Sealove (played by Cristina Piaget) appears in Seeing Double.
Assistant to the scientist who helps abduct the group's manager and attempts to escape with her boss before being arrested.