Mary is having trouble dealing with what she has just seen - Dick transforming Liam into a monkey, which he had done to stop him doing the same to the Earth's population. Dick consults the other Solomons and they decide that the best approach is to deny everything. Meanwhile, Mary meets with Nina and Judith, who confess that they believe Dick to be an international terrorist, so when Dick and Mary next meet, she demands that he tell her the truth about himself. So, Dick tells Mary that he and the others are aliens. Mary's reaction is first disbelief, then shock, and then she finds it sexy to be dating a spaceman. Elsewhere, the local store has been robbed and Sally catches Don hiding in the frozen foods freezer, where he admits that he hid because he was scared. Harry takes a different line and asks the shopkeeper Sam out on a date, but later runs into her working at a posh restaurant, where she instructs him to call her Samantha. Confused, Harry believes that he is dating twins.
Crystal is on a hunger strike to protest about her drugs test results and, after a retest is proved right! - Josh then realises what Di did and prepares for a confronation! Jim was horrified to learn that Helen was the governing governor, replacing Simon Stubberfield! Helen officially appointed Dr Waugh as new prison doctor and seemed to get on really well with him. Josh and Crystal got 'married' in the prison chapel in a service conducted by Babs. Nikki received news that her appeal was being transferred to the high court, meaning she had a good chance of being successful. The Peckham Boot Gang made a noisy arrival at Larkhall but what wing will they be on?(!) After a heavy confronation with Josh about the drugs tests, Di took out her violent anger once again on her mother, and the next day after being called ""sick"" by Josh, spiralled out of control - after being taken home by Jim, she was horrified when he discovered her badly bruised, neglected mother in her house!
Max, Isabel, Michael and Tess struggle with goodbyes on what they believe to be their last night on Earth before they travel back to their home planet. In the final hours, Max frantically searches for the killer that is still out there and threatens the lives of everyone they love.
Ty, Sully, Bosco, and Faith rush to the scene of a school shooting; Sully and Tatiana ponder their future together; Kim continues to struggle with her depression.
Event: JERUSALEM 1099 A.D. THE FIRST CRUSADE Allan has been blackmailed by a collector into finding the world's first Christian cross. It is believed to grant its possessor eternal salvation. The collector has also infected Allan with a deadly virus using the antidote as an extra incentive. Sydney and Nigel must help Allan find and deliver the Cross of Tau and get him the antidote in twelve hours.
Malcolm Wyatt hires Ally to take his case. He's suing a girl for not going to the prom with him after she said yes in fall. The opposing lawyer is Larry Paul, and Ally is nervous about meeting him in court. But he never shows up, and his partner Coretta tells Ally he left for Detroit. Richard hires Jane Wilco as the office's new secretary, but after she gets the cold shoulder from some people, Richard wonders what ever happened to the friendly workplace he once built. Ally talks to Billy's ghost and decides to go to Malcolm's prom as his date and convinces him to sing solo and never stop believing in love.
Mary tries to right a wrong by explaining to Lucy that she never had adult relations with her sister's fiance. The only problem left is trying to convince Lucy. Wilson unexpectedly drops by the Camden home from New York to see if he and Mary are really over by finding out her answer. James talks to Eric about him attempting to have an affair with Annie as Serena comes clean with Annie about her trying to have an affair with Eric. Robbie and Wilson set aside their differences so that they can talk about Mary. Matt learns a few things when it comes to Cheryl's honesty when she doesn't tell her friends that she's dating him.
When Ray and Debra find Frank painting their house, they find out that Marie put him up to the job due to his retirement. But when Frank paints it the colour they don't like, Ray fires him. That's when Marie reveals the truth behind Frank's retirement.
As Ray escorts Ally to a father-daughter dance, he realizes how grown up and independent his daughter has become. As a result, he begins to recall the day, nine years ago, when the Barone clan welcomed her into the family, but not without incident.
Carrie discovers that she is pregnant and she is panicked that the timing is all-wrong. Meanwhile, Deacon and Kelly begin to reconcile and Spence is left out in the cold and Arthur insists that Doug build him his own bathroom in the basement.
Mulder, Doggett and Skinner attempt to fight off the alien replicants, and they find a connection to the conspiracy that leads into the FBI while Reyes and Scully head to a remote farm to safeguard the birth of Scully's child.
Milo runs for school president against Debbie Klimer, leader of the snobby Debbies, and he loses -- but then his opponent suffers a freak accident. The Klimer family fakes young Debbie's death while she goes under the plastic surgeon's knife, but the operation is less than successful and Debbie returns looking like The Phantom of the Opera. Shunned by her upscale family and friends, The Oblong clan and the valley kids take in the reject Debbie as one of their own. But when Debbie's cheerfulness starts getting on everyone's nerves, the valley kids turn to the freakish school nurse to get Debbie back with the in-crowd.
Three old men from Yorkshire who have never grown up face the trials of their fellow town citizens and everyday life and stay young by reminiscing about the days of their youth and attempting feats not common to the elderly.
With Ricky's life still a mess, Julian tries to convince him that it's time to marry Lucy. Reluctant at first, Ricky changes his mind when Julian suggests that people will always think that Ricky is gay unless he marries Lucy. Julian's engagement present to Ricky is the '76 New Yorker, which for weeks was up on blocks in his front yard, and is now made operational thanks to a few purloined replacement parts.
Lois is two weeks late with her period, causing her and Hal to panic and start a big fight, while trying to keep it from the boys. And while Dewey is scared that his parents may split up, Hal and Lois remember the troubles of getting their previous four sons.
When Homer refuses to pay a five dollar airport tax to fly to Delaware, the family is forced to ride in a livestock car of a train instead. There they meet a singing hobo who tells three tall tales: Homer as Paul Bunyan. Lisa as Connie Appleseed, a parody of Johnny Appleseed. Bart as Tom Sawyer with Nelson as Huckleberry Finn.
Yet another academic misstep by A.J. forces his parents to contemplate military school. Tony orders Ralph to deal personally with the Jackie Jr. situation, and later seems to take Ralph's side in a money dispute with Paulie. Once again, the family gathers in Artie Bucco's restaurant, where Meadow reflects on being a Soprano.