Walter "Walt" Lloyd is a fictional character portrayed by Malcolm David Kelley in the American ABC television series Lost.

Walt is introduced in the pilot episode as one of the survivors aboard the plane, which crashes onto the island where most of the program takes place.

Walt is then released by the Others in the episode "Live Together, Die Alone", who claim that he was "more than [they] could handle",[1] and he and Michael leave the island at the end of season two.

After auditioning many children for the part, Kelley was hired by the program's producers, who had been impressed by his performance in the 2002 film Antwone Fisher.

When being developed, Lost's creators intended for Walt to display supernatural powers, such as the ability to summon animals through telepathy, but when Kelley had aged significantly for him to no longer convincingly look ten years old, the character's arc was changed and Walt was written out of the show.

Two weeks before Walt's second birthday, Susan tells Michael that she and her boss, Brian Porter, are planning to get married and will be moving to Rome, Italy, at the end of the month.

Brian pleads with Michael to take custody of the boy and even gives him tickets for the flight to Sydney and back, plus money for travel expenses.

Walt takes Vincent, the dog, and leaves camp, heading into the jungle, where he encounters a polar bear.

As Michael is inspecting the technical equipment inside the hatch, he unexpectedly receives a message that he believes is from Walt.

[1] While off the island, Walt learns that Michael killed Ana-Lucia and Libby and decided to live at his grandmother's house so as not to speak or have anything to do with his father.

[11] In "The End", Lost's final episode, neither Walt nor Michael feature among the main characters moving on to the afterlife.

They were narrowed down to a top three, with Malcolm David Kelley winning the part after the producers were impressed with his role in the 2002 film Antwone Fisher.

While the first four seasons move slowly through time and only months have passed on the show, the actual filming stretched over several years.

When asked about the production difficulties associated with Walt and possible appearances of the character in the fourth season, co-creator Damon Lindelof stated: "We've always known Malcolm was going to grow faster than we could shoot the show.

[1] Kelley himself was also under the impression that his character possessed "magic powers",[17] but after he had aged significantly enough for him to look no longer ten years old, the writers' plans were changed, and Walt was written out at the end of season two.

Chris Carabott of IGN described the relationship "or lack thereof" between Walt and his father as "heart wrenching".

[19] She also named the scene of Walt and Michael reading letters towards the end of the episode as "one of [her favorites] of the entire season".