Toshiba has developed a robot which it says can withstand high levels of radiation to work in nuclear disaster areas - and has the crucial ability to climb stairs.
The four-legged robot can climb over debris and venture into irradiated areas that are off limits to humans.
Operators should also never lose track of the device because it can move automatically to an area with a better signal if the connection becomes weak.
However the machine - a bulky camera on wobbly metal legs - also appears to be prone to glitches.
The robot was winched into place at the start of the demo The robot broke down during a demonstration to reporters, freezing with one leg up in the air, and had to be lifted by several people and rebooted.
It was also notably slow in climbing a flight of eight steps, cautiously lifting its legs one by one, and taking about a minute to go up each step.
Stairs have eluded robots in science fact as well as science fiction for decades.
Initial incarnations of the Daleks failed to manage the feat - even needing smooth surfaces rather than rough ground over which to travel.
And ED-209 famously fell down a flight of stairs while pursuing Robocop, ending up on its back kicking and screaming like a baby.
The Toshiba bot succeeded where ED-209 failed - it climbed the stairs Toshiba wants the robot to enter Japan's crippled Fukushima Dai-ichi nuclear plant, which suffered a meltdown following the earthquake and tsunami that struck in March 2011.
But the firm has admitted it may need as long a 10 minutes to work out how to clear objects when they are not as even and predictable as steps.
And if the robot ever falls over, it will not be able to get up on its own.
The robot did break down once, and had to be rebooted Nevertheless, Tokyo Electric Power Co, which operates the Fukushima plant, said it might use the robot to inspect the suppression chamber.
Toshiba began developing the robot in the hope that it would prove useful in helping to decommission the plant.
No human has been able to enter the highly irradiated chamber since the tsunami disaster, and decommissioning Fukushima Dai-ichi is expected to take decades.
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