Spin-offs
The first Tenchi spinoff is the Magical Girl Pretty Sammy series, a magical girl series where Sasami is the lead character. The first use of Pretty Sammy was in the Tenchi Muyo! Sound File, a Japanese-only music video release. The same animation was used in the ending of the Tenchi Muyo! Mihoshi Special. In 1995, a three episode Pretty Sammy OVA series began, where Sasami, who is known as Sasami Kawai, magically becomes Pretty Sammy. The second Pretty Sammy series is a TV series, which came out in 1996, also known as Magical Project S. This series is in a separate continuity from the OVA series. Pretty Sammy also appears in the Mihoshi Special toward the end of Mihoshi's story, and in an alternate reality sequence in the Tenchi Universe series.
The second is Tenchi Muyo! GXP, which was released in Japan in 2001. The series takes place during the Kajishima version of the OVA continuity, and is set a year after the events of the third OVA series (despite being released first chronologically). The main character of this twenty-six episode TV series is Seina Yamada, a friend of Tenchi Masaki who accidentally joined the Galaxy Police. Many characters from Tenchi Muyo! Ryo-ohki make appearances in this series, including the use of Seiryo Tennan as a major character and a full-fledged Tenchi Muyo! crossover in episode 17.
Sasami: Magical Girls Club, shown in Japan in 2006, is the third spin-off with Sasami (known here as Sasami Iwakura), as the main character.
Other versions of Tenchi Muyo! are also available as graphic novels, video games and radio dramas.
The series Dual! Parallel Trouble Adventure is related to the Tenchi Muyo! Ryo-ohki universe, due to the blatant use of the "Lighthawk Wings" associated with the Jurai dynasty in Tenchi Muyo. Mecha Zinv from Dual! appears in Tenchi Muyo! GXP, Kiyone, Ramia, and Misao appear in a brief easter egg cameo in the series' OVA special ("Final Frontier", also known as episode 14), and there is much speculation concerning the ancient civilization that the character "D" is from. The creator of both Dual! and Tenchi Muyo!, Masaki Kajishima, confirmed that Dual! does relate to Tenchi Muyo!, and is in fact an alternate version of the Tenchi Muyo! universe. All of the Tenchi series put together would bring 98 episodes.
The most recent Tenchi spin-off series is a Japanese anime called Tenchi Muyo! War on Geminar, which follows the tale of Tenchi's half-brother Kenshi Masaki as he finds himself in a foreign world that uses humanoid machines to fight their wars.
Guardians of Order published an English-language role-playing game based on OVA episodes 1-13.
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