YellowRobo

From Questportal

YellowRobo is one of the strongest and smartest of The Five Robots. In Portal48 some of his tech was stolen by Phantomnex in human form. Yellow Robo is the only robot who can enter the Portal Room that is seen on the Wall of time.

YellowRobo and RedRobo are the only Robots who can open Portals.