Tennant promises Freema is "brilliant"

David Tennant has revealed that he is confident about Freema Agyeman becoming a hit with Doctor Who fans.The actor promised that Freema is "brilliant" and added that her character Martha Jones's instant crush on the Doctor will spice up the show."Freema is absolutely brilliant. She's pretty much hit the ground running," Tennant told the Daily Star. "She has been so assured from day one that really there wasn't a second of worry. She's brilliant."I suppose you could say Martha's a bit more honest about what she is feeling than Rose ever was. But it's good because it's a format that's essentially static, so you've got to keep finding ways of looking at it from a different angle. I think the relationship between the Doctor and Martha is just different enough to move the story on."Doctor Who returns to BBC One tonight at 7pm.