The Master, in the guise of Professor Thascalos, has constructed at the Newton Institute in Wootton a device known as TOMTIT - Transmission Of Matter Through Interstitial Time - to gain control over Kronos, a creature from outside time. The creature is summoned but proves to be uncontrollable.

When an aging ex-IRA man is found dead, a Garda inspector suspects the involvement of his old comrade, now a powerful politician and industrialist. But pursuing the case is likely to have consequences for both the policeman and his family.

A look at the making of the Doctor Who story, The Time Monster.