Beat the Invisible Enemy!
Rukia and Chad are fighting the Hollow who was hunting the young boy's soul. Chad cannot see the Hollow but he can sense it and attacks it. Rukia can see the Hollow, but since she still has none of her Soul Reaper powers her attacks have no effect. A little while into the fight Ichigo appears and starts fighting the Hollow. When Ichigo defeats this Hollow it is sent to Hell and not the Soul Society because the soul slayer can only cleanse sins after death not ones during life.
Aired 02/11/2004EP 5 - Beat the Invisible Enemy!
Bleach
Ichigo Kurosaki is a rather normal high school student apart from the fact he has the ability to see ghosts. This ability never impacted his life in a major way until the day he encounters the Shinigami Kuchiki Rukia, who saves him and his family's lives from a Hollow, a corrupt spirit that devours human souls.
Wounded during the fight against the Hollow, Rukia chooses the only option available to defeat the monster and passes her Shinigami powers to Ichigo. Now forced to act as a substitute until Rukia recovers, Ichigo hunts down the Hollows that plague his town.