Professor Bernice Summerfield: 26th century archaeology professor, and tutor at St Oscar's University on the planet Dellah. Prone to getting involved in adventures, scrapes and general derring-do armed only with her wits, cunning and a flask of brandy! Aged about 35ish, but frequently says she's younger. Odd that... The Time-Rings: Given to Benny and her ex-husband Jason as wedding rings, they are two extraordinarily powerful devices which, used together, can take them anywhere in time and space. Bernice has now found a reason to use them once again...