Zeppotron

Background
Zeppotron is a television production company founded in 2000 by Charlie Brooker that usually produces non-scripted comedic programmes, game shows, and sometimes drama shows. In 2002, Endemol purchased the company.

1st Logo (November 1, 2001-January 2002)
Logo: Essentially, the logo consists of the stylized white text "zeppotron.com" in between a and a  bar.

FX/SFX: None.

Music/Sounds: The ending theme of the programme.

Availability: Extinct.
 * It had a very short lifespan and was only seen on two shows: Unnovations and TV Go Home.
 * Neither programmes are available on home media and are gone from television.

2nd Logo (2002-February 9, 2018)
Logo: It's just the standard Endemol logo from the period, but with the text reading "zeppotron" underneath the logo.

Bylines:
 * 2002-March 31, 2016: "an endemol company"
 * August 5, 2016-February 9, 2018: "part of EndemolShineGroup" (in the same font as the Endemol Shine logo).

Variants:
 * The font may slightly vary on some shows.
 * Sometimes, a copyright notice containing the company name is included, either reading "Zeppotron Limited", "Zeppotron Ltd" or just "Zeppotron".
 * On 8 Out of 10 Cats, the text has a thick black shadow.
 * On early episodes of 8 Out of 10 Cats, the logo is flat and the disc has a white border.
 * On one episode of Charlie Brooker's Screenwipe, the episode began with the normal introduction before Charlie Brooker suddenly mentions there's no time left in the show and says goodbye as the "end" credits appear, where this logo is shown. This was done as part of a segment against networks pushing back credits at the end of the show--the episode ended with him just dumping his viewers back onto BBC Four once it was over.

FX/SFX: Same as the Endemol logo.

Music/Sounds: Same as the Endemol logo.

Availability: Common.
 * Seen on many programmes from this period, most of which are usually produced for the BBC or Channel 4.
 * It debuted on a 2002 Channel 4 rerun of TV Go Home, plastering the previous logo, and was later seen on 8 Out of 10 Cats until series 20 as well as 8 Out of 10 Cats Does Countdown until series 15 (which would be the logo's last appearance), the first two series of Black Mirror, Would I Lie to You? until series 10, among many others.
 * DVD and streaming prints of these shows have this logo intact.

3rd Logo (November 20, 2017-)
Logo: Within a box cut-out, two diagonal, lines emerge, growing in thickness and intersecting. After that, another bar forms, sliding downwards and eventually stopping alongside the other lines, creating a striped, transparent box. Before completing their sequence, the text "zeppotron" fades and slides in from the left, tilted 90 degrees clockwise.

Bylines:
 * November 20, 2017-October 28, 2021: "part of EndemolShineGroup" (in the same font as the Endemol Shine logo).
 * December 24, 2020-April 18, 2021: "A Banijay Company", with the Banijay logo to the left of the Zeppotron logo.
 * September 2, 2021-: "We are Banijay", with the Banijay logo to the left of the byline.

Variants:
 * Sometimes, the logo is bylineless.
 * A still version exists.
 * On Late Night Mash, the logo is shown within the UKTV Original Production logo and has both the Endemol Shine Group and current Banijay bylines underneath.
 * Programmes co-produced with Channel 4 has the logo on top of a thin white bar.

FX/SFX: The bars moving and the text sliding in; 2D animation.

Music/Sounds: The ending theme of the programme.

Availability: Current.
 * Debuted on series 11 of Would I Lie to You? and was seen on recent series of 8 Out of 10 Cats and 8 Out of 10 Cats Does Countdown, beginning with series 21 and 16 respectively as well as new shows like The Ranganation and Late Night Mash, among others.
 * The byline with the Banijay logo next to Zeppotron's was only seen on series 14 of Would I Lie to You?.