This episode is the first of the show that separates Booth and Brennan from investigating a case - and it is not recommended.
It starts with Booth being bothered by a music-blaring ice-cream truck, shooting at it and has now to see a psychiatrist before being allowed back into the field.
So Bones is on her way to Florida and paired up with Special Agent Tim "Sully" Sullivan (played by Eddie McClintock), to investigate the murder of a college girl who was eaten by an alligator.
After a bumpy start Brennan and the new Agent solve the case and he asks her out, which starts the storyline which I like the least of the entire show.
While Bones is busy investigating and flirting without him, Booth is trying desperately to get his shrink Dr.Wyatt (played by the brilliant Stephen Fry) to sign a paper that allows him back to work. He even has to built a barbecue for the doctor.
"Girl in the Gator" is not an outstanding episode. It is still good but lives mostly on the interaction between Booth/Wyatt. I sorely missed the Booth/Bones interaction. It doesn't help that there is no chemistry between Bones and Sully, which becomes even more prominent in the following episodes.