Renee Walker Returns to '24,' Severs Criminal's Hand (VIDEO)

Renee Walker returned to '24' last night to help Jack Bauer and CTU track down Russian mobsters in possession of weapons-grade plutonium. And, in a display that made even Jack Bauer give pause, Walker severed the hand of a criminal in order to get one step closer to the gang members.

Prior to this, Bauer tried unsuccessfully to convince CTU officials that Walker was unstable and not ready for deep-cover operations. Since last season, she has retired from the FBI in shame and suffered a mental breakdown.

Watch the video after the jump.Renee Walker returned to '24' last night to help Jack Bauer and CTU track down Russian mobsters in possession of weapons-grade plutonium. And, in a display that made even Jack Bauer give pause, Walker severed the hand of a criminal in order to get one step closer to the gang members.

Prior to this, Bauer tried unsuccessfully to convince CTU officials that Walker was unstable and not ready for deep-cover operations. Since last season, she has retired from the FBI in shame and suffered a mental breakdown.

Watch the video from TV's Top 5! below.