That's what Vicki wonders aloud. The last story of Doctor Who's second season finds the Doctor, Vicki, and Steven landing in Northumbria, in the summer of the fateful year--drum roll please, 1066. References to that include a conversation with Edith, the wife of the Saxon village headman Wulnoth, who mentions good King Edward, i.e. Edward the Confessor, who died earlier that year, and Harold Godwinson, a.k.a. Harold II, who would be runner-up at the Battle of Hastings. The Saxons are indeed wary of Viking raids, and sure enough, some of them appear in future episodes.
However, a monk sees the TARDIS land and watches with intense curiosity. "I wonder..." he says pensively. He also does something extraordinary. He raises the left sleeve of his robe, and stares in bewilderment at his bare wrist. Hmmm...
The Doctor's curiosity is piqued by something and to that end, he goes to the monastery, only to find some things that don't belong there, like a grammophone record, for one. However, he delightfully enjoys the mead offered him by Edith, which he drinks from a horn.
This is Steven's maiden voyage in the TARDIS, and he is skeptical that he has entered a time machine. His question to the Doctor on some equipment on a ship leads to this reply by the Doctor: "That is the dematerialization control. And that over yonder is the horizontal hold. Up there is the scanner, those are the doors, that is a chair with a panda on it. Sheer poetry, dear boy. Now please stop bothering me." Vicki laughs in response to Steven's bewilderment. On finding a Viking helmet, Steven's skepticism is answered by the Doctor's flippant quip: "What do you think it is, a space helmet for a cow?"
This story not only tells the audience that the Doctor's TARDIS is not unique, but also introduces the concept that history can be changed, unlike previous straight historical tales such as Marco Polo, The Aztecs, and The Reign Of Terror. The regulars turn out well, with William Hartnell (the Doctor) his usual crotchety but curious self, eliciting his high-pitched "hmmphs!" and giggles. Peter Butterworth (the Monk) also comes out good in his comic portrayal. With Jacqueline Hill (Barbara) and William Russell (Ian) having left the series in the previous story, it falls upon Maureen O'Brien (Vicki) to be senior companion, and she comes out well, with Peter Purves (Steven) showing some resourcefulness in briefly outwitting the Monk in Episode 3.
Not a bad historical story, even if the fight scenes aren't overly dramatic.