Walter grew up in British Columbia. He went to Penn State University on a football scholarship, earning a degree in physics. Walter met Bruce Banner while he was a freshman. Although they only worked with each other for one semester, Langowski decided to focus on gamma radiation research. He played a few years for the Green Bay Packers, becoming very wealthy. He then continued his graduate studies at MIT. He was appointed to McGill University in Montreal. He studied all he could on the Hulk after learning that he was a transformed Banner. Guardian provided additional funding for a research facility at the Arctic Circle.
While on leave from the university, Dr. Langkowski began working on a gamma radiation experiment that could create a being like the Hulk, only under more controlled circumstances. Being bombarded by massive amounts of gamma radiation, Walter turned into a huge creature. He then went on a rampage until being found unconscious by Snowbird. Shaman and Snowbird helped Walter learn how to keep his personality and intelligence in his bestial form. He called himself Sasquatch noting the resemblance to the creature also called Bigfoot. After training in the Gamma and Beta Flight programs, he was accepted into Alpha Flight.
He continued to research and teach at Simon Fraser University when not adventuring. Aurora became his lover and he assisted her with her powers. He assumed the closeness to the Aurora Borealis prevented him from turning green like the Hulk and other gamma-powered beings.
However, the experiment had instead opened a portal to the Realm of Great Beasts rather than empower Langkowski. He was linked to the beast known as Tanaraq. The more he transformed, the more Tanaraq was beginning to overtake him, especially when he grew angry or felt pain. Snowbird was forced to transform herself into a similar form and ripped the beast's heart out, killing him. Alpha Flight traveled to the Realm of Great Beasts to reclaim his spirit, Shaman sending it into the Box robot.
Walter and Bochs immediately began to search for a new body. Walter refused to enter the temporarily mindless Hulk and seemed to disappear. But he instead went into the body of Smart Alec, who had been thrown into Shaman's pouch. When Songbird appeared to die in her Sasquatch form, Walter entered the body. Transforming back left him in a female body. Now going by Wanda, this new state was awkward for Langkowski, especially when it came to working with Aurora. He and Snowbird were able to revert to their normal selves.
After Alpha Flight disbanded, Walter continued his gamma ray research at Project Michelangelo in Antarctica. Deadpool attacked the base and caused the core to overload, endangering the entire world. Sasquatch and Deadpool teamed up to shut the down the core. Later on he found Guardian in the snowy wastelands of Antarctica.
Department H captured an actual Sasquatch and forced it to serve the team, assuming it was Langkowski with amnesia. When the creature was killed, Walter was assumed dead. Meanwhile, Walter found his former teammate Guardian in the snow of Antarctica and nursed him back to health. This led to Walter discovering that Department H was up to some shady activities. Walter reassembled the original Alpha Flight and confronted the new Alpha Flight. After Department H was exposed he rejoined the team. He continued to serve the team, and led it for some time.
Original Sasquatch Form
Physical Transformation: Originally, Walter had the ability to transform himself into his original Sasquatch form at will. While he originally believed his powers were the result of exposure to gamma radiation, the experiment he used opened a mystical rift and linked him with the Great Beast Tanaraq. Walter's Sasquatch form was actually Tanaraq's body and, while transformed, Walter possessed not only his normal personality and intelligence, at least for most of the time he possessed Tanaraq's form, but various superhuman physical attributes.
Current Sasquatch Form
Physical Transformation: Walter can transform from his normal form to Sasquatch at will in much the same way as he originally did. At first he needed to enter a meditative state taught to him by Shaman and Snowbird. While he still retains his personality and intelligence in his transformed state and many similar powers to his original form, many of these powers are displayed as either not as advanced or on par with how they were before depending upon the issue.
While transformed, Walter's body is covered with thick, Brownish-Orange fur that helps keep his body comfortably protected from extremely cold weather. However, this fur becomes very uncomfortable in tropical climates. While in his normal form, Walter requires glasses to give him 20/20 vision.