Sir Frost is a crypto-zoologist during the 1880s Great Britain. In the film Sir Frost is a crypto-zoologist during the 1880s Great Britain, yearning to prove his worth as a member of the English Adventurers Club, but is always turned down by the club's leader, Lord Piggot-Dunceby, for his unorthodox belief in evolution and the unknown creatures of myth. His luck finally changed after receiving a letter that confirmed the existence of the enigmatic Big Foot of the United States. From then on Sir Frost meets up with the film's deuteragonist, the eponymous Missing Link/Susan, who asks of Sir Frost to take him to the Hymalayes in order for him to live out his life amongst the Yeti.certainly cultivates the image of one. He's a cultured, British explorer from old money who goes on grand adventures to unearth exciting new discoveries, all while maintaining a dignified and somewhat snarky demeanor. His goal in the movie is to join an exclusive club of other "adventurers" who are really just stuffy, snobby aristocrats.He was once friends with his colleague, Aldous Fortnight, but they had a falling-out at some point, the implication being that Lionel was angered Adelina chose Aldous over himself. Adelina calls Lionel out on not even attending the funeral and trying to simply buy Aldous’s final discovery from her for his own benefit. Adelina was later married to Aldous, but he died in a incident. Her name now is Adelina Fortnight. Lionel Despite being egotistical and self-centered, he is a very honorable man, rescuing his assistant from Nessie and even helping Mr. Link go find his relatives for relatively little in return, and never goes back on his word.