Question: Which actor stars in both Cardboard Boxer and Sideways?

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Nava System: The Nava System was a ski binding and custom ski boot offered for sale in the 1980s.  The system used a combination of flexible sole plate to keep the boot centered, and a spring-loaded plastic arm on the rear binding that was used to transmit sideways motions of the leg to the ski.  This eliminated the need for a hard shell on the boot; the Nava boot was soft and resembled a knee-high winter boot.  In spite of numerous endorsements by racing stars, the system never caught on and sales ended by the late 1980s.

Paul Giamatti: Paul Edward Valentine Giamatti ( ; born June 6, 1967) is an American actor and producer.  He was nominated for an Academy Award for Best Supporting Actor for the film "Cinderella Man" and is also known for his roles in the films " Thunderpants", " Private Parts", " Sideways", "American Splendor," "The Illusionist", "Cold Souls", "Barney's Version", "Big Fat Liar", "Love & Mercy", "Straight Outta Compton", "San Andreas", and "Win Win", as well as the series "Downton Abbey" and the miniseries "John Adams".  He has won two Golden Globe Awards, a Primetime Emmy Award, and four Screen Actors Guild Awards.

Cardboard Boxer: Cardboard Boxer is a 2016 American drama film written and directed by Knate Gwaltney.  The film stars Thomas Haden Church, Terrence Howard, Boyd Holbrook, Rhys Wakefield and David Henrie.  The film was released on September 16, 2016, by Well Go USA Entertainment.

Sideways: Sideways is a 2004 American independent black comedy drama film directed by Alexander Payne and written by Jim Taylor and Payne.  A film adaptation of Rex Pickett's novel of the same name, "Sideways" follows two men in their forties, Miles Raymond (Paul Giamatti), a depressed teacher and unsuccessful writer and Jack Cole (Thomas Haden Church), a past-his-prime actor, who take a week-long road trip to Santa Barbara County wine country to celebrate Jack's upcoming wedding.  Sandra Oh and Virginia Madsen also star.

The Sideways Light: The Sideways Light is a 2014 American mystery film, drama film, written and directed by Jennifer Harlow.  It stars Lindsay Burdge, Annalee Jefferies, Matthew Newton and Mark Reeb.  The film had its world premiere at the Austin Film Festival on October 23, 2014.  The film was released on video on demand on March 1, 2016 by Indican Pictures.

Attakathi: Attakathi (English: "Cardboard Knife" ) is a 2012 Indian Tamil romantic comedy film written and directed by Pa.  Ranjith, a former assistant of Venkat Prabhu.  Produced by Thirukumaran Entertainment and distributed by Studio Green, it stars Dinesh, Nandita and Aishwarya Rajesh.  The film garnered attention after being praised and promoted by several acclaimed directors.  It was released on 15 August 2012.  "Attakathi" fetched positive reviews and emerged successful at the box office.

Cake (firework): A cake firework, also known as a multiple tube device is a firework comprising a series of Roman candles, small aerial shells, or a combination of both, connected together by a high-speed fuse.  Typically, the internal fusing is set to fire each tube in series, or to fire several tubes at the same time, or a combination of these.  Typically a cake will resemble from the outside a simple cube or other rectangular covered shape; after firing, a large number of cardboard tubes (the candles) will be visible in the top of the firework (the paper cover having been blown off by the discharging stars).  In a traditional cake, all the candles point upwards; a variant is called the "fan" or "angle" cake.

Thomas Haden Church: Thomas Haden Church (born Thomas Richard McMillen; June 17, 1960) is an American actor, director, and writer.  After co-starring in the 1990s sitcom "Wings", Church became known for his film roles, including his Academy Award-nominated performance in "Sideways" and his role as the Sandman in "Spider-Man 3".  He also made his directorial debut with "Rolling Kansas".

The Cardboard Lover: The Cardboard Lover is a 1928 silent romantic comedy film produced by Cosmopolitan Productions and distributed by Metro Goldwyn Mayer.  It was directed by Robert Z. Leonard and stars Marion Davies and Swedish actor Nils Asther.

Linda Mancini: Linda Mancini is an American writer, actor and Bessie Award winning performance artist.  Her short film, "This Is Not About You", was screened nationally on the PBS anthology series, American Playhouse.  In 1999, Mancini appeared in the short film, My Mother Dreams the Satan's Disciples in New York (by Rex Pickett, author of Sideways), which won an Academy Award for Best Short Subject in 2000.

Supporting paragraphs: Cardboard Boxer Thomas Haden Church
Answer: Thomas Haden Church