Guest Stars James Blendick voices Galactus Marc Strange voices Lord Glenn Camilla Scott voices Shalla-Bal Aron Tager voices Master of Zenn-La Gary Krawford voices Thanos Credit Only Cedric Smith voices Various Jennifer Dale voices Various Alison Sealy-Smith voices Various Norm Spencer voices Various Colin Fox 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