Wow, I got a lot of different responses and quickly.Jeffery Long Said ....
Glau was in Firefly with Nathan Fillion.
Nathan Fillion has a show Castle in which Rider Strong was on an episode of.
Rider Strong starred with Cerina Vincent in the horror movie Cabin Fever.
Cerina Vincent was the yellow Galaxy Ranger.Peter said...
Summer Glau guest starred in an episode of CSI with Marg Helgenberger.
Marg Helgenberger worked with Christopher Gorham in another episode of CSI.
Christopher Gorham worked with Pua Magasiva in "The Other Side of Heaven." Pua Magasiva was in Power Rangers Ninja Storm.Josh Frish Said...
Summer Glau was in Firefly with Nathan Fillion
Nathan Fillion was in Slither with Elizabeth Banks
Elizabeth Banks was in Invincible was Mark Wahlberg
Mark Wahlberg was in The Lovely Bones with Rose McIver aka Summer Landsdown/Ranger Yellow in RPM.T.K. Said...
Summer Glau was Dollhouse, with Amy Acker (also in an episode of Angel--"Waiting in the Wings")
Amy Acker, who was on Alias. Greg Grunberg was on Alias (interestingly enough, he was written out early in the fifth season, so he and Amy didn't get to interact much, if at all). It's technical, since they were not in the same episode, you need someone who was. So I think you have to stick Jennifer Garner in there.
He was on Felicity with Amy Jo Johnson.Nicole Cook Said...
Summer Glau was in the TV series "Firefly" with Jewel Staite, who was in the Nickelodeon series "Space Cases" with 
Walter Jones, who played the Black Ranger in the original Power Rangers.SHORTEST ONE! She wins!Actually, I was thinking about this...
Summer Glau was on Angel with David Borenaz ("Waiting in the Wings," 4th Season)
David Borenaz was on Buffy with Sarah Michelle Gellar.Walter Jones was in an episode of Buffy.OR
Glau was in Firefly with Nathan Fillion.
He was on Buffy with Sarah Michelle Gellar.
Walter Jones was in an episode of Buffy.OR
As zapbranagin said...
Summer was in Dollhouse with Eliza Dushku.Eliza Dushku was in Buffy with Sarah Michelle Gellar.Walter Jones was in an episode of Buffy. It's technical, since they were not in the same episode, you need someone who was.
Rumor is that Summer Glau auditioned for Alyssa in PRWF but lost to Sandra McCoy, who after being selected was replaced by an actress whom Koichi Sakamoto's wife could stunt double. I did not know this. Same thing I heard about Jessica Rey (Kendall).
Someone mentioned Michelle Trachtenberg, that's easy. She was in an episode of Space Cases with Walter Jones, who was the Black Ranger.
Steve Carell was in Evan Almighty with Lauren Graham
Lauren Graham starred in Gilmore Girls
Chad Michael Murray was in a couple of episodes of Gilmore girls. He once starred in One Tree Hill.
Michael Copon was in One Tree Hill and played Lucas/blue in Time Force.
Jackie Chan made cameos in his animated series.
Adam Baldwin voiced Finn in Jackie Chan adventures. He was in Firefly and Serenity with Summer Glau. re: summer glau.
