At the end of October we wrote that Robby the Robot — one of our all-time favorite non-human characters — was up for auction. But even though he’s priceless to fans of the 1956 film Forbidden Planet, in which he makes his on-screen debut, it was impossible for Bonhams auction house to place an Earth dollar value on the Altair IV relic.

It turns out that he’s worth $5,375,000.