Dragon Ball Z season 4

The fourth season of the Dragon Ball Z anime series contains the Garlic Jr., Future Trunks, and the Androids arcs, which comprises Part 1 of the Cell Saga. The episodes are produced by Toei Animation, and are based on the final 26 volumes of the Dragon Ball manga series by Akira Toriyama.

The 32-episode season originally ran from September 1991 to May 1992 in Japan on Fuji Television. The first English airing of the series was on Cartoon Network's Toonami block, where Funimation Entertainment dub of the series ran from November 1999 to October 2000.

Funimation released the season in a box set on February 19, 2008 and in June 2009, announced that they would be re-releasing Dragon Ball Z in a new seven volume set called the "Dragon Boxes". Based on the original series masters with frame-by-frame restoration, the first set was released November 10, 2009.

English dub production
Beginning with the episode "Goku's Special Technique", the Vancouver-based Ocean Productions began their own alternate English dub for the remainder of the series, in association with French company AB Groupe. This dub used the same scripts and episode titles as the concurrent Funimation dub. Ocean's actors had previously voiced the original Funimation/Saban Entertainment dub of the first two seasons, which aired between September 1996 and May 1998 on first-run syndication. In 1999, they had been replaced for the third season by Funimation's new Dallas-based voice talent. Most of the original Ocean actors returned to their roles, however, the Saban Entertainment background score from the first two seasons was not used, instead being replaced by recycled music from the 1994 Ruby-Spears Mega Man cartoon, which Ocean was involved with. The composers of the recycled Mega Man music, Tom Keenlyside and John Mitchell, also composed a brand new theme song, which replaced Saban's "Rock the Dragon" theme song from the first two seasons. Parts of the dub were recorded at Westwood Studios instead of Ocean Studios, which has led to some fans referring to this as the "Westwood dub", in order to distinguish it from the earlier Ocean-voiced dub of the first two seasons. This alternate dub aired on the British version of Toonami in the early 2000s, and later Canada's YTV, which kept using the Funimation dub up until the Cell Games episodes of Season 6. The American version of Toonami and Australia's Network 10 continued to air Funimation's Dallas-voiced dub.