Gregory Michael

When Barney and Quinn start living together, Barney's reluctance to throw out any of his old possessions makes the gang doubt his faith in the relationship. Ted, Marshall and Barney hold their triennial `trilogy time' event, at which they watch the `Star Wars' film trilogy and try to picture how their lives will have developed in another three years.

ZBZ tries to get back to number one whilst Lana tries to corrupt Rusty when she, Rusty and Cappie hang out together.

Casey and Cappie are finally back together. Elsewhere, Rusty and Dale's argument comes to a head and the ZBZ girls prepare for `Song Fest'.

Casey volunteers to assist in planning a ball to raise money to rebuild the Gamma Psi house.

After she falls into a manhole risking her life, coupled with the Kappa Tau's throwing an "End of the World" party, Casey is sent into an emotional tailspin, questioning her relationship with Max and her lingering feelings for Cappie. Whom will she choose to be with at the "end of the world"? Meanwhile, Ashleigh faces her own punishment with Pan Hellenic after a complaint is lodged by Frannie for the Homecoming Float sabotage. Ashleigh turns to Casey to help fight the charge, but when Casey gets caught up in her own personal drama, she leaves Ashleigh to face Frannie alone. And with Dale having trouble keeping his cougar girlfriend's sexual advances at bay and Calvin trying his best to resist hooking up with his new hot roommate, Grant, Dale convinces Calvin to go in on a "purity pledge" partnership so they can help each resist their most recent temptations.