Episode 31: A Race Through Dark Places (Season 2, Episode 8)
Synopsis: In which Mr Bester returns to hunt down an “underground railroad” for rogue telepaths, forcing Talia to make some hard decisions. Meanwhile Sheridan also makes some hard decisions on where to sleep.
For those outside the U.S. (and probably some within), the Underground Railroad was a series of routes and safehouses for helping African-Americans escape from slavery in the pre-Civil War U.S. to freedom in free states and Canada. http://www.history.com/topics/black-history/underground-railroad
Power Girl and the infamous “boob window”