Catherine Willows (Marg Helgenberger) returns to "CSI: Crime Scene Investigation" for the milestone 300th episode. (Michael Yarish/CBS) (Michael Yarish/CBS )

A criminal who Lance put away years ago is on the run. After breaking out of prison, he’s on a new type of crime spree on this week’s “Arrow” (CW at 8 p.m.), and with Felicity as bait, Arrow, Diggle and Lance try to catch him.

Brick works on writing a new town motto on “The Middle” (ABC at 8) while Frankie and Mike are chosen to drive a cow float in a parade celebrating Orson’s 100th anniversary. Axl and his friends try out a new moneymaking scheme, and Sue uses Brad to make Darrin jealous.

Gloria attempts to hire a male nanny despite Jay and Manny’s distaste for the idea on “Modern Family” (ABC at 9). Mitchell and Cameron ask Pepper to help plan their upcoming wedding, and Jay and Phil attempt to cure Frank’s loneliness.

After being stabbed by the Reaper, Hotch experiences visions of his late wife and nemesis on “Criminal Minds” (CBS at 9). The Behavioral Analysis Unit searches for a missing teen and investigates the girl’s estranged father as a suspect.

“Top Chef” (Bravo at 10) turns to Vietnam for inspiration when the chefs learn about the country’s cuisine, culture and customs before serving a multicourse meal. Baohaus owner Eddie Huang is guest judge.

Scarlett is put in a tough spot when Jeff orders her to flaunt her sex appeal on stage on this week’s “Nashville” (ABC at 10). Elsewhere, Rayna wants to buy the rights to her music and Gunnar and Avery work with Scarlett’s friend Zoey.

After putting Kyle’s body back together, Zoe tries to give him back his old life on “American Horror Story: Coven” (FX at 10). Lead witch Fiona takes on an unlikely protégé while Madison has a heated and telling exchange with their new neighbor, Joan Ramsey.

“CSI: Crime Scene Investigation” (CBS at 10) celebrates its 300th episode with original cast member Marg Helgenberger returning as Catherine Willows to help solve a cold case that has haunted the team for 14 years.

Actor, comedian and musician Steve Martin joins stand-up comedian Kathleen Madigan on the “Late Show With David Letterman” (CBS at 11:35), along with musical guests The Kruger Brothers with Steve Martin.

Actor Harrison Ford and host Piers Morgan come to “The Tonight Show With Jay Leno” (NBC at 11:35) with musical guest Daughtry.

Rapper and entrepreneur Sean “Diddy” Combs comes to “Jimmy Kimmel Live” (ABC at 11:35) with panelist and musical guest Keith Urban.

— Rachel Lubitz