We're all familiar with celebrities promoting products and services. The world of Doctor Who is not immune to this.

In 1976, Jon Pertwee (Third Doctor) promoted traffic safety in this public service announcement using an overly complex acronym that was supposed to help children remember to look both ways.

Tom Baker and Lalla Ward (Fourth Doctor & Romana II) invited consumers to "Step Into the 80s" with this series of commercials for Prime Computers.