A Sea Rex is a large, limbless, marine carnivore that is always hungry and eats anything in its path; it especially likes Gabbits. Alf describes its size as indeterminable because it is always undulating through the water, but says it could easily swallow his entire Rehab. Alf has said that Sea Rexes are not hunted, either because of their size or because they taste bad.
The Sea Rex first appeared to fans as a non-linked image on the ‘Wildlife Characters’ page in the official Oddworld website’s new Oddworld Universe section when it was first published in July 2000, but days later Paul O’Connor mentioned that the creature might be confined to FMVs, a possibility reiterated the next year by Lorne Lanning in an interview published around the same day that the Sea Rex picture was removed from the Oddworld Universe page.
Technical director Matt Aldridge confirmed that the Sea Rex had been ‘built’, but didn’t specify if he meant in realtime. An FMV featuring a Sea Rex was broadcast on GameSpot TV very early on in Munch’s Oddysee’s promotional campaigns, but the Sea Rex was not included even in an FMV in the final game because of technical reasons. The cut FMV was later included on the Movies of Oddworld bonus DVD.
A number of large skeletons seen in concept art, FMVs and gameplay from all four Oddworld games have over the years been theorized to belong to Sea Rexes by fans on the Oddworld Forums, particularly the two large skeletons that appear in the ‘Paramite Run’ and ‘Brewery to Be’ levels of Munch’s Oddysee. Regarding these latter, Alf has speculated that they may belong to a beached Sea Rex, but this might be a reference to the fan theories themselves.
- Johnson, Cathy & Daniel Wade (eds) (15 September 2004). ‘Oddworld: Munch’s Oddysee’, p. 226. The Art of Oddworld Inhabitants: The First Ten Years 1994–2004. Mylor: Ballistic Publishing.
- Lanning, Lorne (11 May 2001). ‘Lanning Interview’, q. 9. XboxAddict.com.
- Varahramyan, Farzad (6 February 2000). ‘Munch: Sea Rex’ character sketch. In Cathy Johnson & Daniel Wade (eds) (15 September 2004). ‘Oddworld: Munch’s Oddysee’, p. 227. The Art of Oddworld Inhabitants: The First Ten Years 1994–2004. Mylor: Ballistic Publishing.
- Alf (1 December 2002). Alf 24, q. 9 from paramiteabe. Alf’s Rehab & Tea. Official Oddworld website.
- Alf (15 March 2002). Alf 17, q. 3. Alf’s Rehab & Tea. Official Oddworld website.
- Niteowl_ODD (2 August 2000). ‘Re: Munch's Oddysee delayed’. Exoddus Club. Yahoo! Clubs.
- O’Connor, Paul (7 August 2000). ‘[Oddworld An Ode to the Nocturnal...]’. Oddworld Group. eGroups.com.
- Lantra (12 May 2001). 1 in ‘sea rex picture eliminated’. Oddworld Discussion. Oddworld Forums.
- Aldridge, Matt (23 March 2001). ‘CG Team’, q. 11. OddChat. Transcription by Abe Babe. Oddworld-Web.
- Elum (12 May 2008). 15 in ‘very bad news for all us sea rex and rat fans’. Oddworld Discussion. Oddworld Forums.
- Alf (1 July 2004). Alf July 2004, q. 8. Alf’s Rehab & Tea. Official Oddworld website.