TONIGHT'S MIGHT SEES

"THE BIGGEST LOSER," 8-10 P.M., NBC

This show is down to its final four now, filled with record-breakers.

Mike Morelli, who turns 19 today, is the biggest-losing contestant ever; in 22 weeks, he went from 388 pounds to 224. Tara Costa, 23 when the taping started, is the biggest-losing female contestant ever; she went from 294 to 169.

Then there's Ron Morelli, 55, Mike's dad; he went from 430 to 289. And Helen Phillips, from 257 to 154.

Tonight, we see them return home to try to do it on their own for 30 days. They come back to run a marathon (or walk, in the case of Ron, who has bad knees and a hip replacement), have a final work-out and a weigh-in. Two people advance to next Tuesday's live finale and a shot at the $250,000 prize. They'll be joined by one of the other two, decided by viewers' votes.

"SCRUBS," 7 P.M., ABC

Last Wednesday's presidential press conference complicated ABC's effort to give its comedies an orderly farewell. That kicked this episode to tonight -- one night before the finale for "Scrubs" star Zach Braff and probably for the show itself. The finale of "According to Jim" -- originally set for tonight -- is tentatively delayed to June 2.

This episode has J.D. (Braff) considering a new job, so he can be closer to Kim (Elizabeth Banks) and their son. Meanwhile, Turk takes over as the chief of surgery.