After saving Earth from the Black Hole Generator, a lot of events happen. The girls finally become full fledge Kunoichi, Donnie officially proposes to Madi, and Lesly finally gets to plan the wedding.
The two agree to have a small wedding so that Lesly's family and friends can attend. They tell their family they won't have a reception since they want to travel but that's a lie since they'll actually have a reception but in the lair with all of the mutant friends the couple have made.
It first starts off with her dress.
She then asks the girls to be her bridesmaids. With Gabby being her Maid of Honor.
(Gabby has the darker dress, Madi has the girl on the right dress, and Luci wears the girl on the left dress.)
Leonardo also picks his Tux to wear during the wedding since he will be in his human form and so will the other turtles and splinter.