Baymax
From Tardis Wiki, the free Doctor Who reference
While she was in Antarctica in 2048, Clara Oswald felt like her layers of clothing made her look as big as Baymax. (COMIC: Blood and Ice)
Behind the scenes
Blood and Ice does not specify if Clara is referring to the Baymax of the Big Hero Six comics by Marvel or the Baymax of the then-current animated film adaptation of Big Hero 6 released by Disney in 2014 (which was eventually released in the United Kingdom in early 2015).
Scott Adsit voiced the latter version of Baymax.
