In An Instant (2015)
S06E08 Rip Van Flintstone
Episode Overview
Feeling uninterested at the company picnic, Fred sneaks off for a nap and wakes up to find himself twenty years in the future. To his surprise, Barney has transformed into the wealthy B.J. Rubble, and Pebbles and Bamm-Bamm are now married. When Fred enters the home of Wilma, who is living on Barney's wealth, he suddenly realizes that it was all just a dream.
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S06