Walker, Texas Ranger is the main show for Heroes Sensation. The series revolves around it. Walker begins at the last season, a couples months after the last episode. Nothing is really diferent except the wedding is in the first episode. There is a surprise with new rangers. The two suprises are shown some and revolve mainly around a member in Walker family. The answer you have to fiqure out to even start with the reasoning is which family. His family with Alex or whole Walker Family which includes all the main character. Read the series and start fiquring it out.
Season 1's Episodes:
Find Walker, Texas Ranger.