NGTV Guide: Tuesday, May 19

Season finales plus a sneak peek at one of fall’s most anticipated shows send our final Tuesday of the season off with a bang.

The Mentalist – CBS 9/8c – SEASON FINALE
“Red John’s Footsteps” – The serial killer surfaces again, killing a girl and abducting her twin sister. Is it a trap for Jane?

Glee – Fox 9/8c – SNEAK PEEK
The worst high school glee club in the country gets a major boost when teacher Will discovers that the school’s star quarterback, Finn, has a voice to match diva Rachel’s. Can he convince Finn to join the club? Whet your appetite for next fall’s singing sensation with tonight’s sneak peek!

90210 – the CW – SEASON FINALE
“One Party Can Ruin Your Whole Summer” – Naomi’s post-prom party provides plenty of drama and Adrianna has her baby.