To celebrate its 50th anniversary, TBS will broadcast a 24-hour special, "Fight TV 24," starting at 8 p.m. Saturday.

Nihon TV occasionally airs 24-hour marathon specials to raise money for charity, but TBS's only charitable aim is to urge people "to do their best, because if you don't try, you can't succeed."

Accordingly, the five-man idol band Tokio (probably the hardest-working young men in Japanese showbiz) will host the event. Tokio hosts two regular weekly series in which they attempt major projects as amateurs. On their Sunday night show "Dash" (NTV, 7 p.m.), they do things like build houses, plant and cultivate rice, and cut timber. On their Tuesday night show "Gachinko" (TBS, 9 p.m.), they help average young people overcome obstacles to their dreams, usually by participating in the effort themselves (if some girls want to lose weight, they lose weight, too).