The Bi-Polar Bear is a superhero dressed as a polar bear who has bi-polar disorder.
He was first seen in "The Tick vs. The Idea Men" watching the news of the Idea Men's threat. Bi-Polar Bear quotes "This Looks Like a Job for Bi-Polar Bear, but I just can't get out of bed this month."
In "Heroes," Bi-Polar Bear was seen in the theme to the titular episode's reality show among the superheroes running from a baby-headed tank alongside two unnamed superheroes.