Isaac Newton had Indian heritage and the Doctor is gay and fancies him.
Yes, the returning showrunner Russell T Davies’ second episode back continues to gleefully rub the faces of the haters in a big pile of steaming Woke. In fact, ‘Wild Blue Yonder’, which Davies also wrote, has a false start purely to do that – ok not purely, also to set up a brilliantly silly running joke - with a little stop off in 1666 when the Tardis crash lands into the tree under which Newton had just had the apple drop on his head, before toddling off again to the location of the episode proper. It’s a highly amusing little flourish, since Newton is played by the excellent British-Indian actor Nathanial Curtis from It’s a Sin, and it causes Catherine Tate's Donna to reflect later, "Wasn’t Isaac Newton hot?", and for David Tennant’s Doctor to concur: “He was, so hot…oh! Is that who I am now?” slightly taken aback at this apparent change of sexuality in his new incarnation. “Well it was never far from the surface,” Donna deadpans.
