Steve Zissou is a fictional character portrayed by Bill Murray in the film The Life Aquatic with Steve Zissou. He is an oceanographer and filmmaker known for his adventurous spirit and quirky personality. Zissou embarks on a journey to hunt down a mythical shark that killed his partner, showcasing his passion for marine life and exploration. The character is also the leader of the Team Zissou, a group of eccentric crew members who assist him on his expeditions. The film combines elements of comedy and drama, highlighting themes of friendship, loss, and the pursuit of knowledge in the vast ocean.