A little Cohen arm-twisting convinces Ryan that, yeah, he should do something special on his 18th birthday. So who's he going to invite to the party at The Bait Shop?
A family whose son is in an alcohol-induced coma accuses Veronica of providing him with a fake ID, prompting a probe that leads Veronica to a clandestine organization with ties to Duncan.
A race to the bottom: Marissa's ties with Volchok may send her into substance-abuse free fall...but not before she gathers herself enough to save the Ryan-Sadie match.
Ryan's off to Albuquerque to invite his mom, Dawn, to graduation. Seth quits Summer, and at Volchok's party, Marissa sees something secretly poured into a drink.
Fed up with Michael's parenting style, the children confront their father with a description of the ideal dad.