How I Met Your Mother: Alan Thicke, Alex Trebek and Geddy Lee are on hand for this new episode, in which Barney (Neil Patrick Harris) discovers a lost episode of Robin's (Cobie Smulders) TV show "Underneath the Tunes" from her days as a Canadian pop star (8 p.m. CBS).
Rules of Engagement: The comedy returns with new episodes (8:30 p.m. CBS).
90210: Naomi and Max (AnnaLynne McCord, Josh Zuckerman) seek counseling to help them decide whether to stay married in this new episode (9 p.m. KTLA).
Monday Mornings: This witty new hospital drama, based on the novel by Dr. Sanjay Gupta, stars Alfred Molina, Jamie Bamber, Ving Rhames and Jennifer Finnigan (10 p.m. TNT).
Hotel Impossible After Anthony: Anthony Melchiorri gets to see how his tough-love advice worked out when he revisits six of the struggling hotels he sought to fix (10 p.m. Travel).
Mea Maxima Culpa: Silence in the House of God: Filmmaker Alex Gibney examines reports of pedophilia within the Roman Catholic Church, focusing specifically on a group of men who alleged that they were abused as boys by a priest at a Milwaukee school for the deaf (9 p.m. HBO).
Pro basketball: The Clippers visit the Washington Wizards (4 p.m. FS Prime).
Hockey: The San Jose Sharks visit the Ducks (7 p.m. FSN).
College basketball: San Diego at Loyola Marymount (7 p.m. TWSN).