With costumes and sets by Sid and Marty Krofft , Hanna-Barbera’s “The Banana Splits Adventure Hour” aired during a period (1968-70) when children’s television embraced the aesthetics of a psychedelic drug trip. The experience of watching “The Banana Splits Movie” is like taking a different drug: Valium.

More of a raspberry than a reboot, “The Banana Splits Movie,” available to buy (and later to rent) on multiple digital platforms, is far less crazy than it wants to be and far more soporific than a synopsis would suggest. The premise is that the Banana Splits’ program is being canceled. The new honcho at the network thinks that the Splits — the fun-loving fur balls Fleegle, Bingo, Drooper and Snorky — aren’t edgy enough for his new vision. Unfortunately, the Splits in this movie are also murderous robots, as implacable as their tra-la-la theme song.