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David Tennant has met with Russell T Davies and sparked rumours of a Doctor Who return.

On Thursday night, eagle eyed fans who were in Cardiff thought they were seeing thing when they spotted David Tennant - the 10th incarnation of the Doctor - in town with the man who brought the series back to life, Russell T Davies.

It's led to speculation that the actor - who will soon appear in Netflix's Marvel series Jessica Jones as as villain - was filming an appearance on his old show.

The current Doctor, Peter Capaldi, appeared in the season four episode The Fires Of Pompeii as Lucius Caecilius Iucundus.

Guess who else was in it? That's right, David Tennant as the Doctor. It was mentioned in Capaldi's debut story, Deep Breath, that the Doctor recognised his face and why this face, so will this be explained with a cameo performance from Mr T?

However, others also speculated that the pair could be back in Cardiff as part of a secret project to mark the tenth anniversary of Doctor Who's ressurection.

Tennant famously returned to join Matt Smith - and Peter Capaldi's eyes - alongside other fellow Doctors in the 50th anniversary special, and so the appearance could be something special.