The BBC has yet to announce a start date for Doctor Who Series 4 in the UK (widely speculated to be 12th April) however the American SciFi network has now listed Friday, 18th April for the first episode (likely to be “Voyage of the Damned”).
If they maintain that schedule, it would make Freema Agyeman’s stateside return as Martha Jones in episode four occur on Friday, 16th May.
If the BBC does indeed transmit on 12th April, Freema would appear back on screens in the UK on Saturday, 3rd May.