The trio is back for more investigations.

Jamie-Lynn Sigler guest stars.

The mafia turns to Peter for help.

Allison starts overhearing conversations.

A rogue wave hits the Direction.

Jo tries to help an Alabama family.

Jor-El searches for Kal-El at the Kent farm.

The detectives link a murder to a drug cartel.

Brian Williams returns for another cameo.

Megan Mullally guest stars as Ron's ex-wife.

Gavin Rossdale cameos as a rockstar.

Mandy Patinkin guest stars as an organ donor.

Will Forte guest voices as Principal Wally.

Pop sensation Lady Gaga appears as herself.

Tricia Helfer guest stars as Chelsea's friend.

Heather Locklear returns as Amanda Woodward.

Tim Gunn and Tabatha Coffey give makeovers.

Edward Norton guests as musician Izzy LaFontaine.

Jennifer Grey guest as Richard's blind date.

Jonah Hill guest stars as a man-child.

Eve guest stars as a choir director.

Lisa Kudrow guests as a mean dermatologist.

Singer Shakira guest stars as herself.

Elisabeth Moss guests as a cancer patient.