Question: Which star in The Betrayed is also a former roller skating champion?

Context paragraphs:
List of roller skaters: The following is a list of notable roller skaters and inline skaters.  The list is sorted by roller skating disciplines (inline speed skating, roller inline hockey, downhill, artistic roller skating), gender and competing nationality.  Note that some definitions of roller skating include inline, while others intend to specify quad skates.

Compulsory dance: Compulsory dances, now called pattern dance in ice dancing, are a part of ice dancing and artistic roller skating in which all the couples or solo dancers perform the same standardized steps and holds to music of a specified tempo and genre.  One or more compulsory dances were usually skated as the first phase of ice dancing competitions.  The 2009-10 season was the final season in which the segment was competed in ISU junior and senior level competition.  In June 2010, the International Skating Union replaced the name "compulsory dance" with "pattern dance" for ice dancing, and merged it into the short dance beginning in the 2010–2011 figure skating season.  Compulsory dances are still skated in international roller skating competitions, however as in ice skating, a new section called the Style Dance was introduced from the 2015/16 season alongside the standard compulsory dances and freedance categories.  The style dance is very similar in structure to the short dance on ice.

Marika Zanforlin: Marika Zanforlin (born June 21, 1983 in Rovigo) is an Italian pairs figure skater and roller skater.  With partner Federico Degli Esposti, she is the 2003-2006 World Roller Skating Pair Champion.  They started competing together in roller skating in 1996.  They switched to figure skating in June 2007.  They are the 2008 & 2009 Italian silver medalists.

European Artistic Roller Skating Championships: The European Artistic Roller Skating Championships is the main artistic roller skating championships in Europe, organized by European Confederation of Roller Skating.

Melissa George: Melissa Suzanne George (born 6 August 1976) is an Australian-American actress.  A former national rollerskating champion and model in Australia, George began her acting career playing Angel Parrish on the Australian soap opera "Home and Away" from 1993 to 1996.  After moving to the United States, George made her film debut in the neo-noir science fiction feature "Dark City" (1998) and later appeared in supporting roles in Steven Soderbergh's crime film "The Limey" (1999) and David Lynch's "Mulholland Drive" (2001).

The Betrayed (2008 film): The Betrayed is a 2008 American thriller film, directed by Amanda Gusack from her own screenplay and starring Melissa George, Oded Fehr and Christian Campbell.

Federico Degli Esposti: Federico Degli Esposti (born June 2, 1980 in Bologna) is an Italian pairs figure skater and roller skater.  With partner Marika Zanforlin, he is the 2003-2006 World Roller Skating Pair Champion.  They started competing together in roller skating in 1996 and switched to figure skating in June 2007.  They are the 2008 & 2009 Italian silver medalists.

European Confederation of Roller Skating: The European Confederation of Roller Skating (Confédération Européenne de Roller Skating, or CERS) is the main European roller skating organization.  The CERS is part of the International Roller Sports Federation, or FIRS.  Varieties of skating governed by the CERS include:

Roller skating: Roller skating is the traveling on surfaces with roller skates.  It is a form of recreational activity as well as a sport, and can also be a form of transportation.  Skates generally come in three basic varieties: quad roller skates, inline skates or blades and tri-skates, though some have experimented with a single-wheeled "quintessence skate" or other variations on the basic skate design.  In America, this hobby was most popular, first between 1935 and the early 1960s and then in the 1970s, when polyurethane wheels were created and "Disco" oriented roller rinks were the rage and then again in the 1990s when in-line outdoor roller skating, thanks to the improvement made to inline roller skates in 1981 by Scott Olson, took hold.

USA Roller Sports: USA Roller Sports (USARS), formerly the United States Amateur Confederation of Roller Skating, is the national governing body of competitive roller sports (inline skating and roller skating) in the United States.  It is recognized by the International Roller Sports Federation (FIRS) and the United States Olympic Committee.

Supporting paragraphs: The Betrayed (2008 film) Melissa George
Answer: Melissa George