Summer Glau

Summer Glau plays Tess Doerner in "The 4400", a 4400 with the power to make people do things, she wants them to do. She first appeared in the two-part premiere of season two, returned for three episodes of season three and will be back for season four. Her first new episode will be the premiere (Sunday, June 17 at 9pm on USA Network) and she will be in four more episodes, besides the premiere. The mentioned four additional episodes will be at the end of the 13-episodes-season according to 4400spoilers.com.

Summer Glau is very busy. She plays the recurring character Crystal on "The Unit" and is part of the new pilot "The Sarah Connor Chronicles".

She played River on Joss Whedon’s "Firefly" and "Serenity" and was a ballerina in "Angel".