Dr. Grant, a past member of the town causes serious panic with his uninvited return. His desire for Allison Blake, also causes significant tension with Sherriff Jack Carter. Founders Day is the day when the town of Eureka was changed from a military installation to a town where the inhabitants could do their work to their true potential. The start to season 4 of Eureka is interesting to say the least, but I guess we have to watch eureka some more to find out.