River Song (Doctor Who)
Talking about acting with Tennant and Catherine Tate (Donna Noble) in her 2008 episode, Kingston said, "We just clicked. I've done guest roles on other shows, but rarely have I felt such a warm bond."  About working with Kingston, Catherine Tate said, "I'm a huge ER fan. When you hold people in awe, it's almost a disappointment when they come in and they're utterly normal. But Alex isn't disappointing at all. She's such a lovely person." David Tennant said, "Alex is terrific. When she's telling you stories about hanging out with George Clooney, you know she's pretty cool."