Guest Stars James Blendick voices Galactus Camilla Scott voices Shalla-Bal Marc Strange voices Lord Glenn Aron Tager voices Master of Zenn-La Gary Krawford voices Thanos Credit Only Cedric Smith voices Various Jennifer Dale voices Various Norm Spencer voices Various Colin Fox voices Various Alison Sealy-Smith voices Various Robert Bockstael voices Various Tara Rosling voices Various John Neville voices Various Elizabeth Shepherd voices Various Uncredited Denis Akiyama voices Watcher Valerie Buhagiar voices Shellaine John Stocker voices Ivar Alyson Court voices Amber Roy Lewis voices Ego the Living Planet