Dark Riku takes the combat chip from the original Baymax and places it in the Darkubes to gather data on hearts as part of an experiment to see if a heart can be created from data. After the Heartless steal enough hearts and cause enough panic throughout San Fransokyo, Dark Riku takes the combat chip back and summons the original Baymax from the alternate dimension, placing the new data inside the empty shell. The Darkubes fuse with Baymax, creating a warped and evil version of the armor the second Baymax wears. Sora and Baymax 2.0 fight Dark Baymax until it is put under enough stress to force it into stasis mode. Hiro Hamada takes out the chip and crushes it. He later creates an identical Baymax program chip to turn the original back to normal. This Baymax is later seen as part of the team.
The armor worn by Dark Baymax is purple and fuchsia, as apposed to the red and blue armor worn by Baymax 2.0. The shoulders have spikes, while the visor has horns and purple eyepiece hiding all but the red glowing eyes of Dark Baymax. Contrary to the streamlined wings of Baymax 2.0's armor, Dark Baymax's end in ridges that resemble feathers. The most distinct difference is the large right hand made of Darkubes replacing the gauntlet Baymax lost; it periodically pulses with red energy.
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