[1] Theia, who had been the subject of very positive reports from her performances in training, made her debut in a maiden race over 1200 metres at Deauville Racecourse in August.
[1] On 5 October, Theia, ridden by Yves Saint-Martin, started the 3/1 favourite for France's premier race for juvenile fillies, the Critérium des Pouliches over 1600 metres at Longchamp Racecourse.
Ridden by Henri Samani she finished strongly but was beaten three quarters of a length by Riverqueen, with Antrona in third, Kesar Queen (later to win the Coronation Stakes) in fourth and Flying Water in seventh.
Theia started third favourite, at odds of 19/4 for the Prix de Diane at Chantilly Racecourse on 13 June, but finished fifth of the eleven runners, seven lengths behind the winner Pawneese.
[2] After a break of two months, Theia returned in the Prix de la Côte Normande at Deauville Racecourse on 12 August in which she was matched against colts for the first time.
On 5 September, Theia, ridden by Gerard Dubroeucq, started 2.3/1 second favourite behind Antrona in the Group Three Prix de la Nonette over 2100 metres at Longchamp.
In October she ran fourth in an allowance race but then produced a much better effort when she finished second to the ex-British Swingtime in the Grade III Las Palmas Handicap.
Towards the end of the season Theia ran third to Star Ball in the inaugural running of the Yellow Ribbon Stakes and third in the San Gorgonio Handicap.
[3] There was no International Classification of European two-year-olds in 1975: the official handicappers of Britain, Ireland and France compiled separate rankings for horses which competed in those countries.