Flipper (1995–2000)

The first season of this show was pretty decent. The characters were interesting, the writing was reasonably good, and the chemistry between the two adult leads (Brian Wimmer as an adult Bud (now Keith) Ricks, from the original '60s "Flipper" TV series, and Colleen Flynn as Pam Blondell, a fellow dolphin researcher) made the show fun for adults as well as kids. The two kids (Payton Haas as Pam Blondell's son Mike and a young Jessica Alba as Maya) were pretty likeable as well. Unfortunately, the producers evidently felt that a show about scientists wasn't interesting enough (exact same thing seemed to happen to "Seaquest DSV" as well), so for the second season they fired the entire cast except Jessica Alba (who afterwards seemed to show up in a bikini far more often) and turned it into a sort of aquatic cop show instead. The quality of the show went downhill in a big way, with lame writing and even lamer characters.