2000 saw the release of a special episode of ''Dinosaurs'', ''[[The Ballad of Big Al]]'', focusing on a single ''[[Allosaurus]]'' specimen.''<ref name="BBC One">{{Cite web |title=Walking with Dinosaurs |url=https://www.bbc.co.uk/programmes/b00sy534/episodes/guide |access-date=12 October 2020 |website=BBC One}}</ref>'' The first entire sequel series released in 2001: ''[[Walking with Beasts]]'', which explored the life of the Cenozoic, after the age of the dinosaurs. Like ''Walking with Dinosaurs'' before it, ''Beasts'' was the idea of Haines. Haines wished to introduce the general public to the assortment of animals of the Cenozoic, typically less represented in popular culture than the dinosaurs.<ref name=":11">{{cite video |title=Tim Haines Production Interview |date=2002 |people=Tim Haines |medium=''Walking with Beasts'' DVD featurette |publisher=BBC}}</ref> Haines served as executive producer on the series, with James and Nigel Paterson producing and directing.<ref name=":12">{{cite web |date=2001 |title=Making Of - TV Production |url=https://www.bbc.co.uk/beasts/makingof/prod/ |archive-url=https://web.archive.org/web/20011223144053/http://www.bbc.co.uk/beasts/makingof/prod/index.shtml |archive-date=23 December 2001 |publisher=bbc.co.uk}}</ref> ''Beasts'' was in terms of effects more challenging to produce than ''Dinosaurs'', owing to mammals having features such as fur, whiskers, eyebrows and various floppy parts absent in dinosaurs, and to audiences being more familiar with how mammals move and act and thus better at spotting mistakes.<ref name=":3" />
[[File:Walking with Spacemen book cover.png|thumb|Initial cover for the companion book of the 20042003 BBC series ''[[Space Odyssey (TV series)|Space Odyssey]]'', initially intended to be part of the ''Walking with...'' franchise as "''Walking with Spacemen''"|upright=0.8]]
In late 2002 and early 2003, further special episodes of ''Dinosaurs'' were broadcast: ''[[Land of Giants / The Giant Claw|Land of Giants]]'' and ''[[Land of Giants / The Giant Claw|The Giant Claw]]''. These specials starred wildlife presenter [[Nigel Marven]] as a "time-traveling zoologist". Marven's inclusion was mainly so that audiences would have a better understanding of the scale of the animals shown.<ref name=":13">{{Cite web |title=The Giant Claw {{!}} Impossible Pictures |url=http://impossiblepictures.co.uk/project/the-giant-claw/ |access-date=18 OctoberMay 20202021 |website=impossiblepictures.co.uk}}</ref> While Haines, James and Impossible Pictures worked on ''Land of Giants'' and ''The Giant Claw'', the BBC produced a further series without their involvement: ''[[Walking with Cavemen]]'', also broadcast in 2003.<ref>{{Cite web |date=19 May 2014 |title='Walking with Dinosaurs' - the Television Phenomenon |url=https://h2g2.com/edited_entry/A87827629 |access-date=25 April 20222023 |website=The Hitchhiker's Guide to the Galaxy: Earth Edition}}</ref> ''Cavemen'' acted as a sequel to ''Beasts'', exploring [[human evolution]]. The series was created by Richard Dale and Peter Georgi, both of whom had previously worked together on documentaries such as ''[[The Human Body (2001 film)|The Human Body]]'', and starred [[Robert Winston, Baron Winston|Robert Winston]] as a presenter.<ref name=":22">[https://www.bbc.co.uk/pressoffice/pressreleases/stories/2003/03_march/12/cavemen.pdf ''Walking with Cavemen'' - BBC One Press Pack] (3 March 2003)</ref> The success of ''Land of Giants'' and ''The Giant Claw'' led to the creation of ''[[Sea Monsters (TV series)|Sea Monsters]]'', broadcast in 20032004, a miniseries exploring the "seven deadliest seas of all time", once again starring Marven.<ref name="bbc">{{Cite news |last=Kettlewell |first=Julianna |date=7 NovemberApril 20032004 |title=Ancient sea monsters bite back |work=BBC News |url=http://news.bbc.co.uk/2/hi/science/nature/3247691.stm |url-status=live |access-date=16 October 2020 |archive-url=https://web.archive.org/web/20201016150627/http://news.bbc.co.uk/2/hi/science/nature/3247691.stm |archive-date=16 October 2020}}</ref>
The series ''[[Space Odyssey (TV series)|Space Odyssey]]'' (20042003), produced by Haines and James at Impossible Pictures together with BBC Worldwide, the Discovery Channel and ProSieben, was originally going to be titled ''Walking with Spacemen''. Both executives of the BBC and ProSieben heralded ''Walking with Spacemen'' as the logical next step in the series, following on from the journey began with ''Walking with Dinosaurs'', ''Beasts'' and ''Cavemen''.<ref name="BBC" /><ref name=":1">{{Cite web |last=Meza |first=Ed |date=27 March 2003 |title=ProSieben, Discovery 'Spacemen' in orbit |url=https://variety.com/2003/scene/markets-festivals/prosieben-discovery-spacemen-in-orbit-1117883674/ |access-date=2 May 20222023 |website=Variety |language=en-US}}</ref> ''Space Odyssey'' used special effects and techniques from the ''Walking with...'' documentaries<ref name=":1" /> to speculate how astronauts may explore the various planets in the [[Solar System]] on [[Human spaceflight|crewed missions]].<ref name="BBC" /><ref>{{Cite news |date=27 March 2003 |title=Blue plaques for film stars' seats |language=en-GB |work=BBC News |url=http://news.bbc.co.uk/2/hi/entertainment/2892155.stm |access-date=2 May 2022}}</ref> Despite the title change, ''Space Odyssey'' has at times been referred to as ''Walking with Spacemen'' also after its release<ref name=":0" /> and the old title was used in some of the companion material, including as the title of the earliest editions of the companion book, co-authored by Haines and [[Christopher Riley]].<ref>[https://www.amazon.in/Voyage-Planets-Beyond-Giles-Milton/dp/0756612659 ''Walking with Spacemen'' (2004) by Tim Haines and Christopher Riley]. ''[[Amazon (company)|Amazon]]''. Retrieved 2 May 2022.</ref>
Instead of a futuristic series, Haines and Impossible Pictures decided to round off the ''Walking with...'' series by making a programme on the before then largely underutilized [[Paleozoic]] era, set before the dinosaurs. ''[[Walking with Monsters]]'', broadcast in 2005, utilized the most sophisticated effects of the entire franchise, owing to advancements in technology by the time of its production.<ref name=":4" />
Framestore and Crawley Creatures returned to do the computer graphics and animatronics, respectively, for every successor series,<ref name=":3">{{cite web |date=2001 |title=Making Of - Computer Graphics |url=https://www.bbc.co.uk/beasts/makingof/cg/index.shtml |archive-url=https://web.archive.org/web/20011221074333/http://www.bbc.co.uk/beasts/makingof/cg/index.shtml |archive-date=21 December 2001 |publisher=bbc.co.uk}}</ref><ref name=":2">{{cite web |date=2001 |title=Making Of - Animatronics |url=https://www.bbc.co.uk/beasts/makingof/anim/ |archive-url=https://web.archive.org/web/20011221070809/http://www.bbc.co.uk/beasts/makingof/anim/ |archive-date=21 December 2001 |publisher=bbc.co.uk}}</ref><!-- sources for Walking with Beasts --><ref name="Framestore">{{Cite web |date=15 February 2012 |title=Framestore CFC Makes Sea Monsters |url=https://www.creativeplanetnetwork.com/news/framestore-cfc-makes-sea-monsters-396143 |access-date=25 October 2020 |website=Creative Planet Network |language=en-US}}</ref><ref>{{Cite web |date=24 May 2019 |title=Films, TV & Adverts |url=https://crawley-creatures.com/films-tv-adverts/ |access-date=17 October 2020 |website=Crawley Creatures |language=en-GB}}</ref><!-- sources for Sea Monsters --><ref name=":4">{{Cite web |date=1 June 2016 |title=Walking With... Series |url=https://www.framestore.com/work/walking-series?language=en |access-date=25 AprilMay 20222023 |website=Framestore}}</ref><ref>{{Cite web |last=Mike |title=The People Behind Prehistoric Animal Animatronics and Puppetry |url=https://blog.everythingdinosaur.co.uk/blog/_archives/2010/10/25/4664347.html |access-date=2 May 2022 |website=Everything Dinosaur Blog |date=25 October 2010 |language=en-US}}</ref><!-- sources for Walking with Monsters --> with the sole exception of ''Walking with Cavemen'', which involved Framestore but not Crawley Creatures.<ref name=":22"/> The practical effects of ''Walking with Cavemen'' were done by several companies, including Altered States FX, Animated Extras and BGFX.<ref name=":CV">{{Cite web |title=fantasy makeups {{!}} hominids and cavegirls {{!}} Suzanne Cave in 'Walking with Cavemen' {{!}} themakeupgallery |url=https://www.themakeupgallery.info/fantasy/hominid/walkingsc.htm |access-date=24 April 20222018 |website=www.themakeupgallery.info}}</ref> After the release of ''Monsters'', Impossible Pictures, Framestore and the others involved were effectively forced to move on from documentary filmmaking and produce other series like ''[[Primeval (TV series)|Primeval]]'' (2007–2011) due to companies and executives losing interest in funding fact-based documentaries on prehistoric life.<ref name=":8">{{Cite web |last=Naish |first=Darren |author-link=Darren Naish |title=Reminiscing About Walking With Dinosaurs, Part 1 |url=https://tetzoo.com/blog/2021/6/23/reminiscing-about-walking-with-dinosaurs-part-1 |access-date=30 April 2022 |website=Tetrapod Zoology |language=en-GB}}</ref>
== Television series ==
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