Lucasfilm Ltd.

Background
Lucasfilm Ltd., LLC is a company founded by George Lucas. Lucasfilm formed THX (later spun-off in mid-2002), Skywalker Sound, Industrial Light & Magic, LucasArts, and Lucas Digital Ltd. On October 30, 2012, The Walt Disney Company purchased Lucasfilm for $4.05 billion. Disney owns the rights to most films produced by the studio that were released by both 20th Century Studios and MGM (while Lucasfilm retains the copyright). Paramount owns the distribution rights to Lucasfilm-produced films that they released with Lucasfilm retaining their copyright. Universal owns all rights to the films that they released, as does 20th Century Studios (itself now owned by Disney) in the case of Star Wars. With Disney's purchase of the studio, distribution of the studio's future films are handled by Walt Disney Studios Motion Pictures and the studio's television output is controlled by Disney-ABC Home Entertainment and Television Distribution (although CBS Media Ventures controls the distribution of The Young Indiana Jones Chronicles).

1st Logo (August 2, 1973-October 21, 1994, April 17-May 4, 2020)
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Logo: On a black background, we see neon green text reading:

A LUCASFILM LIMITED Production

Variants:
 * This text was often shown in different languages depending on the country, sometimes in all-capital letters and different fonts. It may also be referred to as Lucasfilm Ltd., Lucasfilm or Lucasfilm, Ltd.
 * The typeface used varies:
 * On American Graffiti (the first film to use this logo), More American Graffiti and The Empire Strikes Back, the text is set in Helvetica Bold.
 * On Star Wars (1977), the text is set in Univers 65 Bold.
 * On Return of the Jedi, Caravan of Courage: An Ewok Adventure and Ewoks: The Battle for Endor, the text is set in News Gothic Bold.
 * At the end of Radioland Murders, the font is the same as it is on The Young Indiana Jones Chronicles and movies' in-credit notice, sans the "Amblin" credit and in.
 * On American Graffiti, the text is changed to read "A LUCASFILM LTD/COPPOLA CO. PRODUCTION".
 * The original Making of Raiders of The Lost Ark featurette has text.
 * Trailers for Raiders of the Lost Ark superimpose the "A LUCASFILM LIMITED Production" text in yellow over the opening scene of the trailer.
 * On some 4:3 airings and prints of the original Star Wars trilogy, the logo is squished to 4:3 aspect ratio.
 * On several pre-1997 foreign releases of Return of the Jedi, the text is in yellow.
 * The Young Indiana Jones Chronicles and movies superimposed it in white and in a different font, reading "A LUCASFILM LTD. Production in Association with AMBLIN ENTERTAINMENT" below.
 * There is a "remastered" version of this logo.

Technique: None.

Music/Sounds: On the original Star Wars trilogy and the Ewok television films, the second half of the 1953 20th Century Fox fanfare. Silent on More American Graffiti, Radioland Murders, and the 1995 CBS/Fox Video Hong Kong LaserDisc of Return of The Jedi (where the Fox logo was removed in favor of the CBS/Fox Video logo); the opening theme is used on other films.

Availability: Can be seen on the original (pre-1997) theatrical and home media releases of the original Star Wars trilogy (preceded by the 20th Century Fox logo), as well as on American Graffiti and its sequel More American Graffiti (the latter two preceded by the Universal "Zooming Globe" logo). Post-1997 prints of the original Star Wars trilogy now use the 1996 logo; however, 20th Century Fox Home Entertainment released pre-1997 prints of the original Star Wars trilogy on DVD for a limited period of time in 2006, as well as a box set in 2008. This logo was not seen on the original Indiana Jones films, Twice Upon a Time, or Latino, all of which used an in-credit text notice instead. The "remastered" version appears on the last four episodes of the 7th season of Star Wars: The Clone Wars.

2nd Logo (May 20, 1988-July 3, 1996)
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Logo: On a black background, we see some text that reads:

A LUCASFILM Ltd PRODUCTION

The text is written in a fancy Art Deco font with "A" and "PRODUCTION" in normal font respectively. "Lucasfilm" is arched and two symbols somewhat resembling bolts are between "Ltd".

Technique: CGI.

Music/Sounds: Silence or the opening theme of the movie.

Availability: Extremely rare.
 * This logo only appeared in two films: Willow and Tucker: The Man and His Dream. Its final appearance was on early trailers for Star Wars Trilogy Special Edition.
 * It doesn't appear on Radioland Murders, despite showing the print logo on promotional material.

3rd Logo (November 22, 1996-2015?)
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Logo: On a black background, we see some black text with a dark green outline, which reads:

LUCASFILM Ltd

The text is written in the same style as before. As it sparkles, the text changes color to silver and then to.

Variants:
 * On Star Wars: The Clone Wars (2008 television series) and Star Wars: Rebels, the logo is sped up, usually with a copyright notice for Lucasfilm Ltd. under the logo as it animates (except for director's cut episodes and some normal episodes in rare cases).
 * On the trailer for Indiana Jones and the Kingdom of the Crystal Skull, the logo is bronze and solid, and superimposed over the footage in the trailer.
 * On Red Tails, the logo is slowed down.
 * On Double Victory: The Tuskegee Airmen at War (highlights version only), there's a copyright notice.
 * In 2012, this logo was enhanced for 3D. The logo goes from silver text to text with a dark green shadow, hovering in a certain angle.
 * On Strange Magic (including the trailers), an Imp runs onto the screen with a love potion. It jumps around three times, spraying the love potion around as it does so, which reveals the logo. Then, it runs off-screen, and the logo continues its normal animation.

Technique: CGI.

Music/Sounds: Same as the first two logos. In all six Star Wars films, the TCF fanfare, composed by John Williams, was used.

Music/Sounds Variants:
 * On Star Wars: Clone Wars (2003 television series), lightsaber noises are heard.
 * On Star Wars: The Clone Wars (film), Clone Trooper dialogue is used.
 * With the digital releases of the live-action Star Wars films (except the original Star Wars, later retitled Star Wars: Episode IV - A New Hope, still owned by 20th Century Fox), it uses the re-orchestrated final notes from the end title medley of Star Wars: Episode V - The Empire Strikes Back by John Williams, in place of the 20th Century Fox fanfare as Disney removed the former's logo after acquiring the digital rights to those films, until the Disney+/4K prints which brought the fanfare back, but instead uses the next logo, shown below.
 * The Strange Magic variant has the Imp's vocals and sounds corresponding to the animation.

Availability: Can be seen on the Star Wars prequel trilogy and 1997-2015 prints of the original trilogy, as well as other Star Wars media today including the DVD of Ewok before the 20th Century Fox logo. Also appears at the beginning of Indiana Jones and the Kingdom of the Crystal Skull (before the custom Paramount Pictures logo) and on all 1997/1999 prints of The Young Indiana Jones Chronicles television films (some prints of Young Indiana Jones and the Attack of the Hawkmen remove this logo), Empire of Dreams (after the Fox Television Studios logo), Double Victory: The Tuskegee Airmen at War (highlights version) and Red Tails. The enhanced version was seen on the 2012 3D reissue of Star Wars Episode I: The Phantom Menace and Strange Magic. It also appeared on the planned 3D reissues of the (then) remaining Star Wars films, which were eventually released at Star Wars Celebration VII. The music version appeared on the 2015 Digital reissues of all the Star Wars films except for Episode IV - A New Hope, which was still owned by 20th Century Fox at the time. Its first appearance was on the final theatrical trailer for Star Wars Trilogy Special Edition (an earlier version, which was attached to the theatrical release of Independence Day, used the previous logo instead), and it debuted in full just two months later on the Special Edition of Episode IV - A New Hope.

4th Logo (April 16, 2015-)
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Logo: Light shimmers over the Lucasfilm logo in the same style as the previous logos, basically more enhanced in chrome silver text with a moving effect inside of the "LUCASFILM" text that appears to be a pale green.

Variants:
 * On the Star Wars: Trials of Tatooine teaser trailer, the logo is above the ILMxLAB logo, the URL, and the Skywalker Sound logo, all of which are in chrome. Also, the pale green moving effect is.
 * On the 2017 game Star Wars Battlefront II, copyright information is shown below.
 * On trailers for The Book of Boba Fett, the logo shines as normal but the metallic texture of the logo is replaced with a cyanish green material with red rust as a reference to Boba's armor.
 * On the 2020 Disney Investor Day, transitioning from the FX on Hulu panel, from the logos of Hulu, Star, Star+ and Disney+ Hotstar, via the Star Wars logo, the logo is on a starry sky background and stops shining after forming before slowly zooming in. At the end of the panel, the logo is shining and fades to the National Geographic logo, as it's transitioning to the National Geographic panel.
 * On the trailer for Star Wars: Visions, the logo is seen with blue paintbrush strokes and hints of electricity.
 * On trailers for the Obi-Wan Kenobi series, the logo is in a sand-like color scheme and doesn't shine. A bit of sand comes from the left before completely disintegrating the logo.
 * On Obi-Wan Kenobi itself, the logo has a slightly different shine, and is in a brownish gold color.
 * On the first trailer for Willow (2022), the logo is brownish gold in a dark watery background while blue lights shine around the logo.
 * On the second trailer for Willow (2022), the normal logo shines as usual on a very dark watery background, but then blue lights appear and turn the logo brownish-gold, and the logo resumes shining, but blue lights are now shining around it.

Technique: CGI.

Music/Sounds: The opening theme of the movie or silence. The Disney+/4K prints of the Star Wars trilogy and prequels use the second half of John Williams' 20th Century Fox fanfare.

Availability: Current.
 * Debuted on the second teaser trailer for Star Wars: The Force Awakens, and later appeared on the film itself, as well as on Rogue One: A Star Wars Story, Star Wars: The Last Jedi, Solo: A Star Wars Story, and Star Wars: The Rise of Skywalker.
 * It also appears on EA-published Star Wars games including Battlefront (2015), Battlefront II (2017), Jedi: Fallen Order, and Squadrons, as well as on Disney+ releases of the Star Wars trilogy and prequels from 2019 onward, which restore the 20th Century Fox logo (albeit bylineless).
 * It's also seen on Disney+ Star Wars television series, starting with The Mandalorian, the final season of Star Wars: The Clone Wars, and The Book of Boba Fett.