The lyrics to Resident Alien's theme song quickly give away two massive storylines for Alan Tudyk's Harry Vanderspeigle, and while the clues may seem cryptic at first, they become surprisingly clear after actually watching the show. Tudyk has led the Resident Alien cast since the show began in 2021, and with Resident Alien season 4's confirmation, the sci-fi dramedy will keep the actor in the role for at least one more run of episodes. Although Resident Alien season 3's ending raises many exciting questions, the show's theme song may even predict Harry's immediate future.

An excerpt of Brown Bird's "Bilgewater" plays over Resident Alien's ever-changing title sequence. The song gives the show an ominous feel while maintaining the fun of the story. The band went on hiatus in 2013 after frontman and founder David Lamb received a leukemia diagnosis - an illness that sadly took his life around a year later.