This article contains spoilers for The Time Traveler's Wife episode 2.

HBO's The Time Traveler's Wife may well be building to an ending that changes the book and movie ending. The adaptation for The Time Traveler's Wife's TV series is being led by Steven Moffat of Doctor Who and Sherlock fame. In just 2 episodes, it has already shown some changes to its source material that suggest the ending may well differ in large ways from what is expected.

The Time Traveler's Wife tells the love story of Clare (Rose Leslie) and Henry (Theo James). Henry is an involuntary time-traveler and finds himself slipping out of his present to land in various other places in history—generally within his own timeline and frequently at moments of some great emotional or personal significance. Because he eventually meets and marries Clare, versions of himself have been popping up in her life since she was 6-years-old and she's been fantasizing about the day he will first meet her in his own timeline.

Related: Time Traveler’s Wife Secretly Explains Why Henry Can’t Control His Power

There are already changes to characters in The Time Traveler's Wife. With hints that Henry has more control over his powers than in the original and an out-of-sync conversation between Clare and Henry's mother serving as two big examples, other small changes are noted within the first episodes of The Time Traveler's Wife. Some of these smaller changes are innocuous but add to the story: instead of Henry telling his father that he's seen his mother hundreds of times since her death, he explains it to Clare and it's shown to the audience. It would almost be odd for Steven Moffat to change The Time Traveler's Wife so much and not also adapt its ending to fit the story he's telling.

The Book And Movie Follow "All Love Is Doomed"

Annette gives Clare advice in HBO's The Time Traveler's Wife.

In her response to Clare's question (relayed through Henry) about how any couple gets together, Henry's mother Annette says that couples don't get together and qualifies it by adding that they only get together for a time. She says that "All love is doomed." This phrase rings out as a theme for what The Time Traveler's Wife is all about.

The book and movie certainly follow this theme, with Henry dying at 43 because of complications caused by his time-traveling always having him show up naked and sometimes in hostile environments. That this line is in the series suggests that The Time Traveler's Wife might end the same way, but there's a possibility that instead of dying Henry might simply disappear and never come back. Older Clare and Older Henry both talk about Henry going where Clare cannot follow. If this line has more significance beyond the obvious, it's not unreasonable to believe that Henry might jump one day and not come back.

Henry Might Get Stuck In The Past

Clare and Henry meet in HBO's The Time Traveler's Wife.

On their second date, Henry muses to Clare that he wonders if he might one day end up stuck in the past and get written into a book. Instead of the familiar ending of Henry dying and Clare waiting for potential visits from younger versions of him throughout her long life, this might suggest Henry instead gets lost in history in HBO's The Time Traveler's Wife. This could see an ending with Clare finding a book about her husband and taking solace in reading about his life within its pages in lieu of her spending the rest of her life waiting for a farewell that may never come.

Though Henry can generally only travel within his own timeline, Moffat's version of The Time Traveler's Wife makes it clear that it's actually more common for this to happen than in the movie, and it is not a hard rule. Henry is seen watching his parents meet and even talking to his parents multiple times. In the book and the movie, Henry visits Clare a number of times after his death. Though uncommon, there is nothing in the material to suggest that his being stuck in history is impossible. Given that Henry taught himself the rules of time travel, it's likely that much of what he has learned is painted by his experience, not by any specific rule of the universe.

Related: Time Traveler’s Wife: What Happened To Henry’s Mother In The Book?

Time Traveler's Wife Episode 1 Teased A Change

Henry reveals the truth to Young Henry in HBO's The Time Traveler's Wife.

The Time Traveler's Wife episode 1's ending has the oldest version of Henry yet seen saying the line that he goes where Clare cannot follow. This is paired with the ominous vision of his severed feet and pool of blood, but suggests a different outcome than the expected death. Dying is one thing. Going to a place where Clare can't be is another entirely. The line suggests a potential change to the ending of the series: Henry traveling to a time when Clare isn't yet born—a place she truly can't follow.

This decision would echo some popular storylines Moffat has explored in the past while working on Doctor Who. Whether it be Rory trapped in the distant past, a version of Amy stuck in a facility for 36 years, or Season 2, Episode 4's "The Girl in the Fireplace," (which was directly influenced by The Time Traveler's Wife), Moffat has shown a penchant for sticking characters out of time as a form of tragic end or suffering that doesn't involve death.

It Would Make Sense To Change The Ending

Henry visits Young Clare in HBO's The Time Traveler's Wife.

After already changing so much in only 2 episodes, it would make sense to also adapt the ending in a fresh and unexpected way. That the 2009 film uses essentially the same ending as the book leaves this adaptation open to be different and new. With Moffat as its writer, The Time Traveler's Wife is already showing earmarks of his influence. Sherlock and Doctor Who prove Moffat's track record of being unwilling to let main characters die or stay dead. This version of The Time Traveler's Wife is a Moffat story—unless he sticks straight to the ending as written, it's likely to change and mold to fit his leanings as a writer.

That the show has already shown Henry's amputated feet doesn't necessarily mean that the ending is written in stone. It's just as possible for the series to do something surprising and give its fans a new ending to enjoy. Whichever way Moffat decides to take the ending of The Time Traveler's Wife, it will hopefully tell the epic love story of Clare and Henry and give a worthy end to their life together.

Next: HBO's Time Traveler's Wife Admits The Worst Thing About The Book & Movie