In 1999 Disney developed and started testing a remote controlled robotic dolphin. Why? Well they had hopes of studying the dolphins at the Living Seas on Epcot more closely. They also were testing some sort of show with crowd interaction at Sea Base Alpha.
The most interesting part is they took the dolphin, DRU or Del, on the road to Castaway Cay for Disney Cruise Lines. There Del interacted with guests like similar trained dolphin encounters. Some guests even thought he was real.