Ok, first off let's talk about Marty. Marty Saybrooke was originated by Susan Haskell, who has played her from January 1992 through September 1997, making brief appearances in 2004 and 2005. The role was briefly played by Christina Chambers, who played the role from November 2006 to December 2007. (That is the woman you saw in the old clips.) Susan Haskell returned to the role on contract in June 2008.
In November m2007, Cole got kidnapped. Marty and John open up to each other and make love, she gets kidnapped where she is found with her son in Ireland. After trying to escape John and a member of the FBI try making a deal to get them home safely. The van in which they are in is shot, Cole is thrown from the van as it plummets off a cliff, and Marty forces John to find Cole, because she is nothing without her son. As John saves Cole, the van in which Marty is trapped in blows up and Marty is presumed dead. Cole and John fly back to Llanview. Miles, Cole's step-dad, is devastated to hear that Marty has been killed in an explosion in Ireland; on the docks, Miles stumbles upon a distraught Cole holding a gun to FBI agent Lee Ramsey, whom Cole blames for his mother's death. Cole accidentally shoots Miles, who falls into the water. (Miles had blackmailed Marty into marrying her and Cole knew there was something wrong with the ay his mom was with Miles. He didn't like or trust him.)
Nora took Cole in after all that happened and he lived with her.
Now for the Nat/Jess/Rex issues..
Roxy was introduced in 2001 as the wild, irresponsible mother of Natalie and Rex Balsom. It was revealed, that Natalie was actually the biological daughter of Viki and Clint. At first it was believed that when Allison Perkins had kidnapped the Buchanan baby in 1987, another child was returned and grew up to be Jessica Buchanan. Jessica began a tenuous relationship with Roxy, whom she believed to be her mother, and with Roxy's biological son Rex. But when a DNA test on Jessica proved that she was also Viki's daughter, the real story came out.
Mitch Laurence, who had masterminded the kidnapping, had secretly raped a drugged Viki around the same time she conceived a child with Clint. Viki unknowingly became pregnant with fraternal twins, one fathered by Clint (Natalie) and the other fathered by Mitch (Jessica). Dr. Walter Balsom, who had been one of religious leader Mitch's disciples, took Mitch's daughter during delivery, and Viki never knew she'd had more than one child. Mitch, however, wanted his daughter to grow up loved by Viki in the lap of luxury, and sent Allison to kidnap Clint's child. They replaced her with Mitch's daughter (who would become Jessica), and gave Clint's daughter (who would become Natalie) to Dr. Balsom and his wife Roxy. Walter later died, and Roxy turned out to be an irresponsible and absent mother for much of Natalie's childhood in Atlantic City, New Jersey.
In the spring of 2008, Nash becomes involved with mysterious investors willing to help him with his vineyard and make the Brennan Winery a major success, supplying Nash with large sums of cash to overhaul the business. Nash begins working with Jessica's cousin Sarah Roberts, making multiple trips to California as part of a promotional launch tour. Unfortunately, Nash realizes too late that the investors want to steal his land out from under him, and turn it into a "Mall of Tomorrow." Desperate, Nash agrees to Jared's offer to buy the winery via Buchanan Enterprises in order to save his lifelong dream and keep his family's home from being bulldozed. Nash's eleventh-hour salvation disappears, however, when Dorian Lord outs Jared as a fraud at the BE shareholders' meeting, and reveals that all transactions and contracts made by Jared are now null and void. Malcolm and the investors promptly swoop in and take Nash's land once and for all, ordering Nash and Jessica to move out. Enraged, Nash confronts Jared, blaming him and Jessica's sister Natalie for their deception and the loss of his vineyard. When Nash gets in Natalie's face, Jared shoves him away, and Nash accidentally trips over a railing, falling through a skylight to the floor of the Palace Hotel far below.