The fourth-season murder of singer Cijji Dunne still looms large over the main characters of Knots Landing as the series launches its fifth year on the air. After briefly suspecting Cijji's erstwhile lover Gary Ewing (Ted Shackelford) and Gary's wife Val (Joan Van Ark), Federal prosecutor Mack McKenzie (Kevin Dobson) concludes that the guilty party is Chip Robert (Michael Sabatino), the unscrupulous literary agent who'd been representing Val's efforts to promote her novel. Though Chip manages to skip town, he is brought to justice--temporarily, at least--when he is "accidentally" struck down by the car driven by Val's mercurial mother Lilimae (Julie Harris). In a plot development of more wide-ranging significance, Gary Ewing moves out of his cul-de-sac home in Knots Landing and into their new ranch, using money left to Gary by his late oil-magnate father Jock Ewing. Sharing the ranch is Gary's new wife, the conniving Abby Cunningham (Donna Mills), who hopes that by ensnaring Gary she can expand her own base of power. As for Gary's ex-spouse Val, she will inaugurate a brand new story arc near season's end by announcing that she is pregnant--without revealing the identity of the father. Elsewhere, Gary's business partner Karen (Joan Van Ark), still not completely recovered from such past traumas as the murder of her husband, begins to rely heavily upon drugs. New to the cast this season is William Devane as Mack's old friend, Senator Gregory Sumner, who has risen to the highest political circles via his close connections with the Mob. Believing that every man has his price, Sumner will be quite taken aback to discover that Mack is completely incorruptible--whereupon the "good senator" will do everything in his power to destroy Mack. Meanwhile, Greg's daughter Mary Frances (Danielle Brisbois) will enjoy a romance with Karen's son Eric (Steve Shaw). As for Eric's sister Diana (Claudia Lonow), she will befriend the redoubtable Abby and move in with her on the Ewing spread--a plot contrivance that will seal the doom of fugitive murderer Chip Roberts when Diana causes his accidental demise. Another cast addition is Lisa Hartman as waitress Cathy, whose first appearance proves quite a shock to the other regulars, inasmuch as she is a dead ringer for the murdered Cijji Dunne. Also making their first appearances are Douglas Sheehan as reporter Ben Gibson, who comes to Val's aid when she is briefly suspected of murder and falls for her in the process; and Danny Ponce, taking over from Matthew Newmark in the role of Jason Avery. The season's traditional "cliffhanger" finale--which, incidentally, also marks the 100th episode of Knots' Landing--finds Karen being felled by a gunshot meant for Gary, and Abby in the clutches of kidnapper Mark St. Claire (Joseph Chapman). ~ Hal Erickson, Rovi