Michael Williams is a fictional character from the Australian soap opera Neighbours, played by Sandy Winton. The actor's casting was announced in March 2010 and he admitted the role would be challenging, but he would be up to the task. Michael was introduced as the new principal of Erinsborough High, replacing Daniel Fitzgerald. The character made his debut screen appearance during the episode broadcast on 4 May 2010. In November 2011, it was announced that Winton would be leaving Neighbours and Michael departed on 27 March 2012. However, the character made a brief reappearance on 23 May 2012.

Natasha "Tash" Williams is a fictional character from the Australian soap opera Neighbours, played by Valentina Novakovic. The role of Natasha was Novakovic's first acting job and she relocated from Sydney to Melbourne for filming. Natasha was introduced to Neighbours along with her father, Michael Williams and she made her debut screen appearance during the episode broadcast on 5 May 2010. In November 2012, Novakovic confirmed that she would be leaving Neighbours and she filmed her final scenes in December. Natasha departed on 29 March 2013.