After Woman was cancelled, Mumba's music career was put on hold and she began auditioning for films. In 2002, Steven Spielberg picked her to play Mara in The Time Machine. Mara is a girl who is part of a human civilization which has regressed to a hunter/gatherer lifestyle in the year 802,701 AD. She co-starred with Guy Pearce and her real-life brother, Omero and the movie earned $56,684,819 in the US. Mumba's second venture into films was in 2003, where she appeared in the film Spin the Bottle.

In 2005, Mumba returned to acting with the lead role of Jessica in the Irish film Boy Eats Girl. The film was a box office failure in Ireland, making a little over €1 million despite its €5 million budget. In 2006, Mumba starred in the thriller Nailed, playing the character of "Sapphire", Mumba also co-starred in Johnny Was, a British gangster movie. 2007 saw Mumba filming her part in the movie 3 Crosses.

Mumba confirmed on the Late Late Show, February 9, 2007, that a camera crew has been following her on and off for the past 6 months for a Reality TV show which was shown on Channel 4 at the end of March 2007. The show was called Get Your Act Together with Harvey Goldsmith and follows Mumba's attempts to revive her music career with Harvey Goldsmith as her mentor. Mumba starred on the 2008 series of Dancing On Ice but was eliminated in week 3.

• Cross (2009) (in production) .... Ishka
• 3 Crosses (2009) (completed)
  
• Johnny Was (2006) .... Rita
• Nailed (2006) .... Sapphire
• Boy Eats Girl (2005) .... Jessica
• Spin the Bottle (2003)
• The Time Machine (2002) .... Mara