Star Wars: The Clone Wars: The animated series returns for a new season (8 p.m. Toon).
Need to Know: The season premiere of the newsmagazine series features reports on the economy; environment and energy; health; national security; and culture (8:30 p.m. KOCE).
Karaoke Battle USA: In the season finale, the singers perform one last time for judges Carnie Wilson, Brian Scott and Joe Levy, who will decide which contestant gets to represent the U.S. at the Karaoke World Championship in Ireland. Joey Fatone hosts (9 p.m. ABC).
20/20: The investigative series returns for a new season (10 p.m. ABC).
Strike Back: An English doctor is kidnapped in Darfur, which forces Scott and Stonebridge (Sullivan Stapleton, Philip Winchester) to form an alliance with a global arms dealer in this new episode (10 p.m. Cinemax).