THE reality version of “Gilligan’s Island” is under way.

The show’s producers have converged on an undisclosed, tropical location to begin pre-production on the reality show based on the popular sitcom about seven castaways stranded on a deserted island.

“The cast is good and the location’s good, and I think the game is going to be fun to watch,” executive producer Mike Fleiss (“The Bachelor”) told The Post from the set.

The new show will feature a group of people cast to personify the original cast (Gilligan, the Skipper, the millionaire) who work to get off the island.

The show is slated to debut on TBS in November.