
Kevin Stoney was the managing director of International Electromatics, the world's leading electronics company.
Vaughn made contact with the Cybermen, formed an alliance with them, and then masterminded an invasion of Earth in return for a share of the power. He would claim the entire invasion was his work and the Cybermen merely providing the muscle for his plan. Vaughn was semi-converted into a Cyberman; all the modifications were physical and his mind remained untouched. He intended to betray the Cybermen once the planet was conquered and was aware he couldn't trust them.
Using Cyberman technology, Vaughn turned International Electromatics into a world leader in microprocessor technology. He planned to use IE appliances to help the Cybermen in their invasion. He had great political power due to his wealth and by brainwashing figures in the establishment

All Quiet on the Western Front
1979 · as Hollerstein (uncredited)

Cash on Demand
1961 · as Detective Inspector Mason

The Dresser
1983 · as C. Rivers Lane

A Tale of Two Cities
1980 · as Lord Chief Justice

Ivanhoe
1982 · as Fitzurse

Murder at the Gallop
1963 · as Dr. Markwell

The Fosters
1969 · as Calton

The Assassination Bureau
1969 · as Blind Man

Shoot to Kill
1990 · as Judge Kelly

The Blood Beast Terror
1968 · as Granger the Butler

Pope John Paul II
1984 · as Bishop Dygat

The Boys
1962 · as Police Inspector at the Trial (uncredited)

The Ties That Bind Us
2008 · as Mavic Chen / Tobias Vaughan /Tyrum (archive footage)

Jigsaw
1962 · as Mr. Gardner (uncredited)

Interpol
1957 · as Policeman (uncredited)

How to Murder a Rich Uncle
1957 · as Bar Steward

The Siege of Manchester
1965 · as Peter Egerton

The Shadow of the Cat
1961 · as Father (uncredited)