“Smallville” (8 p.m., CW): Chloe gets her brain filled with Kryptonian code.

“Smallville” (8 p.m., CW): Chloe gets her brain filled with Kryptonian code.

“The Office” (9 p.m., NBC): Road trip! On “The Office,” Michael sets out on a business excursion to Canada with Andy and Oscar, who form an unlikely bond. Meanwhile, Jim anxiously awaits Pam’s return from art school.

“ER” (10 p.m., NBC): “ER” continues its final season by welcoming back the late Dr. Mark Greene (Anthony Edwards) for one episode. No, he’s not being resurrected from the dead. He’s just appearing in flashbacks that reveal he had a past with Cate Banfield (Angela Bassett).