‘Who’ loves ya

The time is right for “Doctor Who.” The long-running British series recently broke ratings’ records when a new season premiered on April 23. In Saturday’s episode, the Doctor (Matt Smith) follows a Time Lord distress signal to a mysterious asteroid in a Bubble Universe — could there really be another living Time Lord out there? But the asteroid hides a secret which could threaten the existence not only of the TARDIS crew, but of the TARDIS itself. With Karen Gillan and Alex Kingston.

* DOCTOR WHO

Saturday, 9 p.m., BBC AMERICA

The final ‘Idol’ four

THE boys have dominated the season on “American Idol,” and each has embodied a different singing style: gospel; country; metal and jazz. This week, the competition heats up as only four contestants are left in the show that has happily reinvented itself and managed to get along just fine without Simon Cowell. The harmonious judges are Steven Tyler, Jennifer Lopez and Randy Jackson (below).

* AMERICAN IDOL

Wednesday and Thursday, 8 p.m., FOX

Home is where the heart is

WILL Langston (Laurence Fishburne) finally get his man? After years of pursuit and a countless number of murders, he comes face-to-face with serial killer Nate Haskell, the notorious “Dick & Jane” killer,” inside the house — the one where he was born—where his killing spree began. Broadway vet Bill Irwin returns as Haskell. Tracee Ellen Ross plays Langston’s ex-wife, Gloria. With Marg Helgenberger and George Eads.

* CSI

Thursday, 9 p.m., CBS

Rebel’s cause

Following a murder that appears to be a hate crime, Teresa (Jennifer Beals) risks tipping off Gibbons (Delroy Gibbons) to her big-picture plan by boldly taking on the Chicago Police Department’s corrupt “meritorious” promotion system. Meanwhile, Jarek (Jason Clarke) is forced to face his own reality when Vonda (Devin Kelley) receives an anonymous package that reveals too much about the his family. Co-starring Matt Lauria.

* THE CHICAGO CODE

Monday, 9 p.m., FOX

All about the ‘Glee’ prom

WHEN the entertainment for prom falls through, Principal Figgins (Iqbal Theba) asks New Directions to perform at the dance – to the loud chagrin much of prom coordinator Sue Sylvester (Jane Lynch). Things get heated as the competition for prom king and queen draws closer. Starring Matthew Morrison, Lea Michele, Cory Monteith and Chris Colfer. The guest star is Jonathan Groff.

* GLEE

Tuesday, 8 p.m., FOX