After a year in the Cretaceous period, Abby and Conner escape back to present day in the Season 4 opener. They are greeted by a new ARC team, and find out that their jobs may be in jeopardy after being away for so long. (TV Guide)
U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.